RDIoT Demo

3D Printed ikea skadis pegboard accessories

* Reference Source

- https://www.thingiverse.com/thing:2849398

- https://www.thingiverse.com/thing:2849369

- https://www.thingiverse.com/thing:2853257

- https://www.thingiverse.com/thing:2851040

- https://www.thingiverse.com/thing:2933140

- https://www.thingiverse.com/thing:4042873

- https://www.thingiverse.com/thing:4196820

- https://www.thingiverse.com/thing:4115425

- https://www.thingiverse.com/thing:2791919

- https://www.thingiverse.com/thing:2749146

- https://www.thingiverse.com/thing:2773037

- https://www.thingiverse.com/thing:2347090

- https://www.thingiverse.com/thing:2648038

- https://www.thingiverse.com/thing:3392612

- https://www.thingiverse.com/thing:3181792

- https://www.thingiverse.com/thing:4247453

- https://www.thingiverse.com/thing:2665067

- https://www.thingiverse.com/thing:3772318

SunFounder RAB 5 in 1 Breadboard [B193]

* Specs

1) Compatibale with Raspberry Pi 3 Model B,2 Model B and 1 Model B+. 

2) For any Arduino board whose mounting holes are the same with For Arduino UNO and Mega 2560 can be fixed upon this Holder with screws. 

3) Be able to fix the 400 points and 800 points self-adhesive breadboard.

4) There are M3 fixing holes in the middle which can be used to fix the RAB Holder upon your experiment table.

5) Size:200*135mm ->7.87inch * 5.31inch.

- Technical Details Introduction

RAB Holder, also called Raspberry Pi, For Arduino and Breadboard Holder. Presumably you can know its function from the name. It can ensure the security of your demoboard and avoid placing the demoboard on the desk freely to cause short cut. The RAB Holder also simplifies your experiment when you are building a complex circuit. There are three zones on the RAB Holder and each has a name on it. We have made some slots in the zone that used to fix the Raspberry Pi to make the use more comfortable.

A screwdriver is provided for you to install the Raspberry Pi and for Arduino board onto the holder with screws. 

- Package Contents

2x M3*10 Screw 

4x M2.5*6 Screw 

6x M3*6 Screw 

1x RAB Holder

1 x Screwdriver

USB Heating Heater Plate [B188]

https://www.youtube.com/watch?v=WBh_VG7kWYw

* Specs

Features:

Brand new and high quality.

Plug and Play: easy and convenient to use.you can put it in your shoes,Golves,Mouse Pad and so on.

Specifications:

Color: black

Size:10cm x 8cm-3.93inch x 3.15inch.

Cable length:123cm

Net weight: 25g

Package Included:

1 x USB Heating Plate

USB 5V Mini Tesla Coil Light Energy-Saving Lamp [B189]

https://www.youtube.com/watch?v=jcAQ3Xqu1Sg

* Contents

Mini Tesla coil usb5v power supply, charging treasure or mobile phone charger can provide power for it. 

This product includes a Tesla coil, a USB power supply of money.

Mini CNC Router Laser Cutter 500mW [B177]

https://www.youtube.com/watch?v=QczvDWCYEx4

* Specs

This mini laser engraving machine with high precision and high stability is great for DIY engraving. It supports offline operation, much convenient than normal engraving machine.

Features:

High precision and high stability: with 108 screws and alloy structure make it strong.

Unique frame and weak light automatic positioning: frame positioning makes the image positioning easier, weak light makes it possible to engrave in toothpicks and make the engraved picture with no excess residue.

Offline operation: this machine support operating without computer, only need to prestore a picture and connect the two usb ports to charger or power bank(not included); one button to operate.

Professional power IC and radiator, carving time will last much longer and carving performance will be more stable than other laser.

Truly 500mW blue laser head, high speed and support more types of materials.

Items can be carved including: hard wood, plastic, bamboo, rubber, leather, cut paper, etc.

Come with a pair of protective glasses to protect your eyes from getting hurt by laser.

High resolution printing: 512*512.

Note:

It can not engrave metal, acrylic and any other retardant material.

How to use:

Step 1: Find a win7 / 8 computer. Connect it to two usb ports.

Step 2:Install the software.

Step 3:Start the software.

Step 4:Choose or import a picture, edit it. Make sure the pic is in the mid of the engrave area.

Step 5:  Start engrave.

Specifications:

Material: Acrylic + Aluminum + Stainless Steel

Color: Black

Laser Power: 500mW

Image Format: JPG

Support System: Win7 / Win8 / XP / Win10

Work Area: 38 * 38mm

Item Size: Approx.14.5 * 16 * 19cm / 5.71 * 6.30 * 7.48in

Item Weight: 998g / 35.2oz

Package Size: 30 * 20.5 * 21cm / 11.81 * 8.07 * 8.27in

Package Weight: 1330g / 46.93oz

Package List:

1 * Laser Engraving Machine

2 * USB Cables

1 * Protective Glasses

1 * Wrench

1 * 1GB TF Card(User Manual and Install Software included)

1 * User Manual

Digital Multi Servo Tester ECS [B176]

https://www.youtube.com/watch?v=pz_NQSSGqaw

* Specs

Features:

CCPM Servo Consistency Master / Servo tester

The device also can be used as a signal generator for electric speed controller (ESC), then you can test your motor system without using a transmitter and receiver.

There are 3 modes to check servos or ESC:

Manual mode: turn the knob with different speed, check the reaction time.

Neutral mode: make the servo go back to the neutral point.

Automatic \"window wiper\" mode: make the servo swing like a window wipers in the biggest angle.

It can connect 1-3 servos simultaneously and test such as 1-3 servos consistency and so on.

You can also connect 1-3 ESC to test and compare their reaction time respectively.

It can connect 3 servos of the CCPM helicopters and select servos.

It can also connect the servo of airplanes install the steering-box and adjust planes by using such as the neutral mode and so on.

Specification:

Voltage consumption: DC4.8-6V 

Size: 48 x 42 x 17mm 

Original box: NO

Color: Blue

Item size: 48*42*17 mm

Net weight: 7g

Package weight: 13g

Packet content:

1 x multi Servo tester

LM2596 LED Voltmeter DC-DC Step-Down Module (LM2596S) [B165]

https://www.youtube.com/watch?v=AxUzzxrtlXo

* Specs

With a voltage meter and voltmeter displays self-calibration. Uses a more advanced microprocessor voltage voltmeter error ± 0.05V, Range 0 ~ 40V. (To ensure accuracy voltmeter, make sure the input voltage of 4.5V and above)

Touch of a button to switch the input or output voltage measurements and has a light show which is being measured voltages, and save the settings, even the power off and then on.

Voltmeter can be turned off when not needed touch of a button you can easily achieve the left.

With terminals, no soldering iron can also be easy to use, and to retain bond wire connection points.

Input Voltage 4.0 ~ 40V. (Input voltage must be higher than the output voltage of 1.5v or more)

Adjustable output voltage range of 1.25V ~ 37V continuously adjustable. (Input voltage must be higher than the output voltage of 1.5V)

Output current 3A, recommendations within 2.0A use, high current needed to enhance heat dissipation.

Output power 20W, 15W, please enhance heat dissipation over.

High conversion efficiency, on average 88% (efficiency and the input and output voltage, current, pressure related)

With reverse polarity protection, reverse polarity does not burn

Size 6.1 * 3.4 * 12cm (L * W * H)

Weight: 22g

LM2596S DC-DC Step-down Module (LM2596S) [B033]

https://www.youtube.com/watch?v=JmN_XmsAN-w

* Specs

Model / Name

LM2596S DC-DC step-down module

Input voltage

3.2V to 40V

Output voltage

1.25V to 35V

Output current

3A (max)

Conversion efficiency

92% (the highest)

Output ripple

<30mV

Switching frequency

65KHz

Operating Temperature

-45  to +85

Size size

43mm * 21mm * 14mm (L * W * H)

* Contents

3.2V to 40V -> 1.25V to 35V / 3A

6~40V To 5V 3A Double USB DC-DC Step-Down Module [B117]

https://www.youtube.com/watch?v=dt0OLfG4fwY

* Specs

Features:

100% Brand new and high quality!

This module has short circuit for protection

DIY Mobile Power Supply, 5V output for charging Phone, MP3, MP4, for PSP, etc

Specifications:

Input voltage: 6V-40V 

Output voltage: 5V

Output current: 3A

Switching frequency: 150KHZ

Conversion efficiency: 92%

Working temperature: -40 to +85 degree Centigrade

Color: Red

Size: 59mm x 21mm x 17mm

DC-DC Step-Up Module (MT-3608) [B035]

https://www.youtube.com/watch?v=ORz1vujP93I

* Specs

The 1 module characteristics (booster module):

1) the maximum output current: 2A

2) input voltage: 2 V ~ 24 V

3) the maximum output voltage: > 5V-28 V

4) Efficiency: > 93%

2 Mechanical properties:

1. Product size: 36 mm x 17 mm * 14 mm

3 using the method

Module, the + and - 2 ~ 24 V, the adjusting potentiometer can adjust the output voltage, output voltage than the input voltage

4 note

1. Input voltage should not exceed the maximum input voltage

2. Peak output current does not exceed 2A

0.9V-5V DC-DC Step-up Module to USB [B151]

https://www.youtube.com/watch?v=iX2RbjRNlLg

* Specs

Input voltage: 0.9V-5V DC

Transfer efficiency:96%(max)

With USB port

With working indicator light

with one AA battery power supply output current can up to 200~300mA,

two AA batteries to the output current of 500~600mA

Size:34 x 15 x 7mm

Net weight:4g

Package weight:14g

ACS712T Current Sensor Module 20A (ACS712T) [B039]

https://www.youtube.com/watch?v=6NuyGoSPYO4

* Specs

Supply Voltage (VCC) 5Vdc Nominal

Measurement Range -20 to +20 Amps

Voltage at 0A VCC/2 (nominally 2.5Vdc)

Scale Factor 100 mV per Amp

Chip ACS712ELC-10A

* Contents

- Connect

VCC ---- 5V 

OUT ----- A0 

GND ----- GND 

Power+VCC -> Load/Sensor -> ACS712T (UP)

Power GND  ---------------> ACS712T (DOWN)

- Key Code

#include <Wire.h> 

#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27,20,4);  // LCD2004

const int analogIn = A0;

int mVperAmp = 100; // use 100 for 20A Module and 66 for 30A Module

int RawValue= 0;

int ACSoffset = 2512; // default 2500 but i checked when this is disconnected to 2512

double Voltage = 0;

double Amps = 0;

void setup()

{

  lcd.init();  // initialize the lcd 

  lcd.backlight();

  lcd.print("start LCD2004");

  pinMode(analogIn,INPUT);

  delay(1000);

  lcd.clear();

}

void loop()

{

  lcd.setCursor(0,0);

  lcd.print("B039:ACS712T Current");

  RawValue = analogRead(analogIn);

  Voltage = (RawValue / 1023.0) * 5000; // Gets you mV

  Amps = ((Voltage - ACSoffset) / mVperAmp);

  lcd.setCursor(0,1);

  lcd.print("RawValue=" + (String)RawValue + "  ");

  lcd.setCursor(0,2);

  lcd.print("Voltage=" + (String)Voltage + "");

  lcd.setCursor(0,3);

  lcd.print("=>Current=" + (String)Amps + " A ");  

  delay(1500);

}

B25 Voltage Sensor DC0~25V [B125]

https://www.youtube.com/watch?v=cOpQqT2XffQ

* GitHub : https://github.com/rdiot/rdiot-b125.git

* Specs

Voltage input: DC0-25V

Voltage detection range:DC0.02445V-25V

Voltage analog resolution:0.00489V

* Contents

- Connect

GND ----- GND

VCC ----- X

S ----- A1 

- Key Code

#include <Wire.h>

float val11; 

float val2;

void setup() 

{   

 //pinMode(LED1,OUTPUT);   

 Serial.begin(9600);   

 Serial.println("Emartee.Com");   

 Serial.println("Voltage: ");   

 Serial.print("V"); 

} 

void loop() 

{       

 float temp;       

 val11=analogRead(1);       

 temp=val11/4.092;       

 Serial.print("analog:"+(String)val11+", "+(String)val11+"/4.092="+(String)temp);

 val11=temp;

 val2=((val11)*10)/100;       

 Serial.println(" =====> "+(String)val2+" V");          

 delay(1000); 

}

USB Voltage Current Meter [B037]

https://www.youtube.com/watch?v=ZEU8NXHy-Sc

* Specs

eatures:

100% Brand New and High Quality

Display data: Voltage Current Capacity Time

Specification:

1.Input USB

2.RTZ, Reset button, press it three seconds will Reset

3.Out USB

4.Voltage: 3V-9V ( 1% accuracy )

5.Current: 0-3A ( accuracy of 0.4% )

6.Battery Capacity (0-99999mah)

7.Working time (0-99Hour)

8.The working time and Capacity have Memory function when power off

Color:As the picture show

Size: 7.3cm*2.3cm*1.35cm (LXWXH)

Quantity:1 Pcs

Net Weight: 25g 

Dual Digital Volt Meter 100V 10A [B030]

https://www.youtube.com/watch?v=ooUc6LTzRNI

* Specs

Working voltage:4.5-30V DC

Note: The maximum input voltage can not exceed 30V, otherwise there is the danger of burning

Working current:≤20mA

Display: 0.28" Two color blue and red

Measuring range: DC 0-100V 0-10A

Minimum resolution (V): 0.1V

Refresh rate: ≥100mS / times

Measure accuracy: 1% (± 1 digit)

Minimum resolution (A): 0.01A 

Operating temperature: -15 to 70° c

Working pressure: 80 to 106 kPa

size :47×28×16 mm/1.85*1.10*0.63"

Net Weight:19 g

Weight:29 g

* Contents

- Connect

2Line (Power)

Red ----- 5V (4.5V ~ 30V)

Black ----- GND

3Line

Red ----- External Power +=========> Load (+)

Black ----- External Power GND

Blue =============================> Load (-)

DC 30V Analog Panel Voltmeter [D076]

https://www.youtube.com/watch?v=2WEV6UjXFng

* Specs

eatures:

Ideal analog panel meter to measure voltage for experiment or home use.

With the accuracy of class 2.5, it can measure voltage from 0V to 30V.

Analog panel is easy to read and has low consumption.

Small in size, light in weight, convenient to carry.

Specifications:

Material: Plastic

Color: White

Meter Type: Analog

Accuracy: Class 2.5

Testing Voltage Range: DC0-30V

Item Size: 6.2 * 5.5 * 5.7cm / 2.4 * 2.2 * 2.2in

Item Weight: 56g / 2oz

Package Size: 6.5 * 6.5 * 6cm / 2.6 * 2.6 * 2.4in

Package Weight: 71g / 2.5oz

Solar Charger shield Lipo Rider [B040]

https://www.youtube.com/watch?v=ow1btQdSYx0

* Specs

Solar adaptor connects to solar charge sheet. The output voltage of solar power plate is 4.8~6.5V. 

Interface BAT connects to rechargeable battery. If under charging, the CHARGE light is on. The light turns on when charging is finished. Charge power is 4.2V, and the current is 200 mA.

Open toggle switch, the flat USB can provide voltage 5V and current 100 mA.

It can achieve the port MINI_USB into flat USB port.

TP4056 1A Lipo Battery Charging Board (TP4056) [B036]

https://www.youtube.com/watch?v=ir_M9xli6us

* Specs

Charge module- Linear charging.

Current- 1A adjustable.

Charge precision- 1.5%.

Input voltage- 4.5V-5.5V.

Full charge voltage- 4.2V.

Led indicator- red is charging blue is full charged.

Input interface- MICRO.

Work temperature- -10 to +85.

Inversed polarity- NO. MICRO

18650 3.7V Rechargeable Li-Ion Battery Dual Charger [B084]

https://www.youtube.com/watch?v=Ae7PWvAk66w

* Specs

100% brand new and high quality.

Quantity: 1pcs.

Color: black.

Material: metal and plastic.

Weight:74g.

Input Voltage: AC 100-240V 50/60Hz

Compatible with: 18650  Li-ion Battery

When you plug the 18650 battery into the charger, it will show Red LED Light, and Green means in full charging condition

Output: DC4.2V,1A

Plug: EU plug

Battery are not included

Cable length: 38cm.

This product is very convenient and easy to use.

5V Micro USB 1A 18650 Lithium Battery Charging Board [B076]

https://www.youtube.com/watch?v=aelg6J-Hmoo

* Specs

Inputs with MICRO USB female, can be directly input to do with the phone charger rechargeable lithium battery,

And still retains the input voltage wiring pads, can be very convenient DIY

Input voltage: 5V

Charging cut-off voltage: 4.2V ± 1%

Maximum charge current: 1000mA

Battery over-discharge protection voltage: 2.5V

Battery overcurrent protection current: 3A

Board size: 2.6 * 1.7CM

The first time you access the battery, it may no voltage between the output OUT + and OUT-, then access 5V voltage charge your energy can activate the protection circuit, and the battery from the B + B-, then draw a line on the short open also need recharged to activate the protection circuit. Note that the charger must be able to output 1A or more to do when using a mobile phone charger input, or may not charge

+ MICRO USB female and next - pads for the power input, access 5V. B + positive then the lithium battery, B- then negative lithium batteries. OUT + and OUT- connected to the load, such as positive and negative electrodes connected mobile booster plate or other load.

Connect the battery to the B + B-, inserted into the USB female mobile phone charger, the red light is being charged, the green light to full.

Mobile Universal Battery Charger LCD [B070]

https://www.youtube.com/watch?v=nQeLb5nlBa4

* Specs

Feature:

Brand:YIBOYUAN

100% Brand New and High Quality Universal Battery Charger with USB Output Intelligent dedicated battery charger with USB output.

When the battery is fully charged,automatically stop charging.

Safety cut out circuit,Built-in protection circuit prevents overcharging.

Constant current,constant voltage charging,automatic identification.

The high-quality LCD screen indicates connection and full charge.

Also convenient to interchange your spare batteries Use the data line which corresponds to mobile phone can be charged directly to the phone.

Intelligent Chip: The smart chip protects from short circuit and overload by regulating voltage an ensuring a high effeciency charge. 

Technical Specifications:

Input: AC 100-240V 50/60Hz 150mA

Output: DC 4.2V 400mA +/-50mA,USB Port Output: DC5.2V, 1250mA(USB)

Connecter: US Plug

Short circuit and overload protection

Note: This Charger Just Fit For The Battery (32mm<=width<=55mm)

Compatible for:

For Acer, for Asus, for BlackBerry, for Casio, for HTC, for LG, for Motorola, for Nokia, for Samsung, for Sony Ericsson, for Toshiba, and so on.

Mp3 Mp4 players

Digital cameras

Mobile phones

...and many more rechargeable lithium-ion batteries under 4.7 volts

DC In Line Power Cable Connector Jack LED Strip 12V 1A [B032]

https://www.youtube.com/watch?v=dpESJf7zsA8

* Specs

great for flexible 5050 3528 LED Strip light.

Suitable for many applications including controlling a led strip.(Install switch between power supply and strips)

Connect reliable, work effective.

Supply Voltage: 12V

Output: 1A

Color: Black

Overall Length: 360mm

Switch body approx: 60mmx20mmx20mm(LxWxH)

Working Temperature : 0~40C

Storage Temperature : -20~60c

DC Power Male Plug Jack Adapter [B078]

https://www.youtube.com/watch?v=HTbURTPYebs

* Contents

DC Power Male Plug

2.1mm DC Barrel jack Adapter Connector Female [B031]

https://www.youtube.com/watch?v=EPAcUBZOCJs

* Specs

Temperature Range: -70C ~ +155 C

Connectors: Terminal block, Male 5.5*2.1mm/2.5mm DC

Material: Zinc Alloy + Plastic

Internal diameter of the plug: 2.1mm

External diameter of the plug: 5.5mm

Size: 38 x 13 x 13MM

Weight: 61g

Simply & Professional appearance for power cabling

Easier for camera installation, save time and more securer cable connection

2.1 x 5.5mm CCTV Camera for DC Power Plug Connector.

for DC Power Plug with plastic construction and strain relief.

This 2.1 x 5.5mm Power Plug features one power connector end for DC plug male to another end terminal for CCTV camera connected.

It is a perfect solution for those who want to make custom power cable.

This CCTV Camera for DC Power Connector will provide a great connection.

Internal diameter of the plug: 2.1mm

External diameter of the plug: 5.5mm

It measures approx. 1.5" long, 0.55" wide, 0.5" thick.

2.1mm DC Barrel jack Adapter Connector Male [B059]

https://www.youtube.com/watch?v=QP6weQgG5WI

* Specs

5.5mm x 2.1mm male power plug connector

Internal diameter of the plug: 2.1mm

External diameter of the plug: 5.5mm

Size: 3.5cm x 1.4cm x 1.2cm - 1.37inch x 0.55inch x 0.47inch

DC Power Jack Socket Connector (DC-005) [B034]

https://www.youtube.com/watch?v=Dl0Yxici5OQ

* Specs

Model Number:DC005

DC Power Pinboard [B054]

https://www.youtube.com/watch?v=G4ZJWiWFZhw

* Specs

Features:

100% brand new and high quality

Hole Diameter: 5.5mm

Pin Diameter: 2.1mm

Product size: Approx. 2.8 x 1.3 x 1.2cm

Reserved two single-row needle welding holes, can be installed directly on the peg board, convenient to test

Power Output Interface: 2 ways of VCC, 2 ways of GND

With power indicator

MCH-K305D DC Switching Power Supply 30V 5A (MCH-K305D) [B029]

https://www.youtube.com/watch?v=SeivauVX-CA

* Specs

Model No. MCH-K305D

Line Voltage 200-240VAC,50Hz-60Hz

Input Current (at 220VAC,full load) 0.9A

Output Voltage Range 0-30V

Output Current Range 0-5A

Voltage Display Accuracy ±0.5%

Current Display Accuracy ±0.5%

Efficiency >85%

Load Regulation(10-100%) 50mV

Line Regulation(200-240VAC) 20mV

Ripple & Noise(P-P) 50mV

Load Regulation(10-100%) 20mA

Line Regulation(200-240VAC) 20mA

Ripple & Noise(p-p) 20mA

Operating Ambient -10°c to + 60°c, 30%RH to 90% RH

Size 7(W) x 16(H) x 22(D)cm

Weight 1.35kg

Breadboard Power Supply Module 3.3V, 5V (MB-102) [B022]

https://www.youtube.com/watch?v=RhCuFxrJG2A

* Specs

- Feature

Breadboard power supply module, with 5 V, 3.3 V output voltages

Apply to MB102 Standard breadboard

Input voltage: 6.5-12 V (DC) or 5V USB power supply

Output voltage: 3.3V and 5V can switch over

Maximum output current: <700 ma

Input voltage ON/OFF switch

Independent control of upper and Lower Bread Board Power Rails. Can switch over to 0 V, 3.3 V, 5 V using jumpers on any rail.

On-board two groups of 3.3V, 5V DC output plug pin, convenient external lead use.

- Connection

1x Barrel 5mm Connector (center +ve) for Input Power

1x USB connector for 5V input or 5V output

4x 2Pin Headers pointing downward for 3.3V or 5V output

1x 2×4 Header for 3.3V and 5V output

2x 1×4 selection jumper for 3.3V/OFF/5V

FTDI Basic Breakout USB-TTL 6 PIN 5V Module (FT232RL) [B091]

https://www.youtube.com/watch?v=4DAoEV6L5EE

* GitHub : https://github.com/rdiot/rdiot-b091.git

* Specs

This is the newest revision of our FTDI BASIC. It now uses a SMD 6-pin header on the bottom, which makes it smaller and more compact. Functionality has remained the same.

This is a basic breakout board for the FTDI FT232RL USB to serial IC. The pinout of this board matches the FTDI cable to work with official  cloned 5V  boards. It can also be used for general serial applications. The major difference with this board is that it brings out the DTR pin as opposed to the RTS pin of the FTDI cable. The DTR pin allows a target to auto-reset when a new Sketch is downloaded. This is a really nice feature to have and allows a sketch to be downloaded without having to hit the reset button. This board will auto reset any board that has the reset pin brought out to a 6-pin connector.

The pins labeled BLK and GRN correspond to the colored wires on the FTDI cable. The black wire on the FTDI cable is GND, green is CTS. Use these BLK and GRN pins to align the FTDI basic board with your  target.

This board has TX and RX LEDs that make it a bit better to use over the FTDI cable. You can actually see serial traffic on the LEDs to verify if the board is working.

This board was designed to decrease the cost of  for Arduino development and increase ease of use (the auto-reset feature rocks!). Our for Arduino Pro boards and LilyPads use this type of connector.

One of the nice features of this board is a jumper on the back of the board that allows the board to be configured to either 3.3V or 5V (both power output and IO level). This board ship default to 5V, but you can cut the default trace and add a solder jumper if you need to switch to 3.3V.