SquareWear 2.0 User Manual
Contents
1. battery 45mAH Every time you plug in the mini USB cable it charges the battery automatically SquareWear 2 0 uses rechargeable batteries only either the built in LIR2032 or external LiPo Do NOT use it with non rechargeable batteries such as CR2032 You can power SquareWear by an external Lithium Polymer LiPo battery such as rayshobby net cart accessories acc batteries lipo 700 If using external LiPo please remove the built in coin battery To remove the built in LIR2032 carefully push back the metal tap on the battery holder until you can lift the battery up DO NOT force lifting the battery as it may break the battery holder The build in lithium charger MCP73831 is set to charge at 40mA hour This will fully charge the coin battery in 1 2 hours The charging time for external LiPo varies depending on the battery capacity The green LED will turn off when the battery is fully charged SquareWear has a built in LDO MCP1700 to provide regulated 3 3V from battery When battery voltage drops below 2 7V the microcontroller will stop running In this case you should plug in a USB cable and charge the battery for 30 minutes before using it again You should keep battery plugged in at all times Certain functionality such as buzzer and USB bootloader may not work reliably if the battery is removed Pin Names and Functions O SquareWear 2 0 is based on ATmega328 the same chip in standard Arduino Therefore it us2. 4 http rayshobby net software arduino 1 0 5 squarewear linux64 zip These installation files are based on Arduino 1 0 5 and have pre installed necessary files to get you started They also contain drivers for Windows and SqureWear demos After installation run Arduino 1 0 5 from the installed folder Then in the menu select Tools gt Boards gt SquareWear 2 0 There are many provided example programs which you can find in File gt Examples gt SquareWear2 gt Enter Bootloader and Upload a Program o To upload a program plug in a mini USB cable to the USB port First turn off SquareWear by sliding the power switch to Off position Then press the pushbutton while turning on the power switch At this point the normal application will stop running and the controller will present itself as a USBasp programmer to the host computer In Windows you need to install USBasp driver if you haven t done so previously The driver is included in the Arduinol 0 5 drivers usbasp folder In Linux you need to create a file in etc udev rules d to give permission to the USB device Alternatively run Arduino in sudo mode Next to upload a program click on the Upload button in Arduino Once the program is uploaded the microcontroller will start running the program immediately If the Arduino output reports the following error avrdude error could not find USB device USBasp with vid 0x16c0 pid 0x5dc That means either you did not successf
3. SquareWear 2 0 User Manual e Technical Spec o ATmega328 running at 3 3V 12MHz pre flashed with USBasp bootloader MCP1700 3 3V 250mA LDO linear regulator MCP 73831 lithium charging chip configured to charge at 35mA MCP9700 temperature sensor 10K photo resistor light sensor Four 2N7002 MOSFETs 5mm color RGB LED 8 5mm SMT buzzer 6mm SMT tactile button Charging indicator LED LIR2032 20mm rechargeable lithium coin battery 45mAh capacity 2 0mm JST connector for external lithium battery O O O O O O o SMT mini USB port and power switch e SquareWear 2 0 comes with a pre flashed demo program Clicking on the push button will cycle through all available demos in the program Additional demos are available in the SquareWear 2 0 Arduino library Instructions can be found at the beginning of each program s source code e Hardware Interface W200 a CE Tihshih F 2 s EEE ta A D3 D5 D6 ia J E Looe amp 3 ES Analog and 12C Pins Eg ees ty ne MOSFET pins A2 A5 Push button THITTEGE seeeenee Charging Indicator DO RX g D1 TX Bg Temperature Sensor i a z TE q c F TAE Ami H D10 D11 D13 l i gt F ws y 5 i Buzzer Light Sensor ody N Color LED A er A GND LIR2032 Lithium WCC 3 3 Rechargeable Coin Power Options IMPORTANT o SquareWear 2 0 has a built in rechargeable lithium coin
4. es the same pin names and functions as the standard Arduino O Digital 1 O pins the board has 8 available digital I O pins DO also serial RX pin D1 also serial TX pin D3 supports PWM MOSFET pin D5 supports PWM MOSFET pin D6 supports PWM MOSFET pin D10 supports PWM D11 supports PWM D13 internally wired to blue LED PWM Pulse Width Modulation also referred to as analog output provides adjustable level of voltage You can use PWM to control the brightness of the LED the speed of a motor etc All PWM pins can function as standard digital I O pins but additionally you can use Arduino s analogWrite function to set analog voltage levels As described above D13 is internally connected to the blue channel of the RGB LED Setting this pin HIGH will light up the LED MOSFET Pins D3 D5 D6 support PWM and in addition they are internally wired through MOSFETs The MOSFETs function as Power Sinks This means setting the pins to logical high will connect them to GND and setting them low will disconnect them from GND Therefore in order to use MOSFET pins such as for controlling an LED you need to connect the positive lead of the LED to VCC and negative lead to one of these Power Sink pins By setting the pin high or low you can control the LED The main advantage of Power Sink pins is that they can drive a high amount of current so your LEDs will look very bright your speaker will s
5. ound loud etc You can also use the MOSFET pins to drive a motor a heat wire a muscle wire etc Each MOSFET can drive up to 250mA current You can combine the three MOSFET pins together to drive more current O Analog Input pins SquareWear 2 0 has 4 available analog input pins A2 A3 A4 also I2C SCL pin AS also I2C SDA pin Analog pins can be used to read an analog signal such as sensors They can also function as standard digital I O pins Internally Assigns Pins not available for general purpose applications D2 USB D D4 push button also used to enter bootloader D7 USB D D8 red channel of the RGB LED D9 buzzer D12 green channel of the RGB LED D13 blue channel of the RGB LED AO light sensor Ail temperature sensor o Sewing SquareWear has large pin holes allowing you to stitch conductive threads through them and attach the board to textile or fabric You can also solder wires directly to the pin pads or solder sew on snaps to allow quick attachment to detachment from textile Programming SquareWear 2 0 Pre Requisites o The recommended way to set up software is by downloading one of the following pre configured Arduino installation files Mac http rayshobby net software arduino 1 0 5 squarewear macos zip Win http rayshobby net software arduino 1 0 5 squarewear windows zip Linux32 http rayshobby net software arduino 1 0 5 squarewear linux32 zip Linux6
6. software limitation do not send a string longer than 32 characters at a time Sending a string longer than 32 characters may results in buffer overflow or an error You can also pause the device and host communication by clicking on the Pause button H IDSerial Monitor HID Serial Monitor Output Connect to device first Connected successfully Temp 232 Temp 233 Temp 234 Temp 234 Temp 234 Temp 235 Temp 234 Temp 235 Temp 234 Temp 234 Light 101 Light 103 Light 92 Light 104 Light 92 Light 102 Light 91 Light 104 Light 92 Light 104 Temp e Simulate Human Interface Devices HID o Because SquareWear uses the V USB implementation you can program it to simulate a mouse a keyboard or other HID devices Examples can be found in the V USB website e Using Adafruit s Neopixel Library o The SquareWear software pack has pre installed Adafruit s Neopixel library You can use it to interface with WS2811 2812 2813 LED strips matrices The SquareWear examples include a few demos ledpad xxx These assume the LED strip matrix is connected to VCC GND and pin D1
7. ully enter program mode or if you are in Linux you don t have system permission to use the USB device If the output reports the following warning it s normal Just ignore them avrdude warning cannot set sck period please check for usbasp firmware update avrdude error usbasp_transmit error sending control message Broken pipe o To upload anew program repeat the above steps e Using Existing Arduino Programs O Because SquareWear 2 0 is based on Arduino you can upload any existing Arduino program The Arduino software has numerous example programs Just make sure that you modify the program to match the pins assigned on SquareWear 2 0 e Using the SoftPWM library O O The color LED is not wired to hardware PWM pins so you cannot use analogWrite directly on the color LED But the SquareWear library includes a Soft PWM software PWM library that can simulate PWM on these LEDs To use the library you need to include both HIDSerial h and Soft PWM h in your sketch In the setup function call Sof tPWMBegin then use Soft PWMSet pin value to set a PWM value 0 to 255 to a pin any digital pin Check the fade demo for an example use of software PWM e Using the HIDSerial library O oO O O O SquareWear does not have built in USB serial converter Instead it simulates USB functions in software using the V USB library The serial communication is implemented through the HID human interface de
8. vice protocol which requires no driver installation Check the hidserial demo for example The library is designed to be compatible with Arduino s Serial class as much as possible To use the library you need to include HIDSerial h in your sketch Specify a global HIDSerial class variable For example HIDSerial serial In the setup function call serial begin Use serial write char to write a single character Use serial print or println to write a string Use serial available to check if there is an incoming string from host computer Then use serial read to read the incoming string Important because the library is not interrupt driven you must call serial poll as frequently as possible to handle USB requests in time This can be done by inserting serial poll inthe inner loop and ensure that it s called frequently Host software to use the HID serial function you need to run host software called HID Serial Monitor It s cross platform To use the software First click on the Connect button to connect the device if unsuccessful check if SquareWear is turned on and if you have followed the above descriptions for calling serial begin and serial poll in your sketch Once connected whenever a string is transferred from the device to host it will be displayed in the text area To send a string from the host to the device type the string in the text field and then click on Send e Limitation due to
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