SquareWear 2.x User Manual
Contents
1. USB D D only applies to 2 0 2 1 2 2 Mini available for general use on 2 3 D4 push button also used to enter bootloader on 2 0 2 1 2 2 Mini D8 D12 D13 red green blue channel of the RGB LED D9 buzzer set this pin LOW if not using buzzer A0 A1 light temperature sensor o Breadboard Pins only available on 2 3 SquareWear 2 3 has the following breadboard pins VBAT GND D7 D11 VCC D2 D5 A6 A7 SDA SCL GND VCC o Sewing and Touch Sensing 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 The large pins are also suitable for touch sensing Please refer to the touch sensing demos in SquareWear software library It generally helps increase the touch sensitivity by 1 moistening fingers 2 holding the VCC or GND pins Programming SquareWear 2 x o SquareWear 2 0 2 1 2 2 Mini USBasp bootloader 1 Installation The recommended installation is to use one of the following pre configured Arduino installation files Mac http rayshobby net software arduino 1 0 5 squarewear macos zip o If you encounter error Arduino app is damaged and can t be opened try this work around Win http rayshobby net software arduino 1 0 5 squarewear windows zip o Unless you have installed2. 0 2 1 2 2 Mini does not have built in USB serial converter so it does not appear as a serial port Instead it simulates USB functions in software using the V USB library The serial communication is implemented through the HID human interface device 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 Arduino setup function call serial begin Use serial write char to write a single character 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 HIDSerial 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 in the 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 seria
3. PWM h in your sketch In the setup function call SoftPWMBegin then use SoftPWMSet pin value to set a PWM value 0 to 255 to a pin any digital pin Check the fade demo for an example o Using WS2811 WS2812 WS2813 LED Matrix The SquareWear software pack has pre installed Adafruit s Neopixel library You can use it to interface with WS2811 2812 2812B LED strips matrices The SquareWear examples include several demos under the LED matrix category These demo programs assume the LED strip matrix is connected to VCC red wire GND black wire and pin D10 white wire SquareWear Mini is designed to plug directly into the 5x7 chainable LED matrix and use pin D10 for data Thus all Mini demos assume the LED data pin is connected to pin D10 Refer to the documentation on SquareWear chainable color LED matrix for further instructions o Interface with External I2C and Serial Devices Squarewear 2 3 has breadboard pins which match the layout of several typical I2C and Serial devices such as the MPU6050 gyro accelerometer and Bluetooth transceiver You can solder breadboard pins to SquareWear 2 3 and plug in sensors accordingly See picture on the right o Using the HIDSerial Library SquareWear 2 0 2 1 2 2 Mini Note SquareWear 2 3 has hardware USB serial converter so you can use standard Arduino Serial class and the Serial monitor The discussions below only apply to 2 0 2 1 2 2 Mini SquareWear 2
4. SquareWear 2 x User Manual Last update Feb 6 2015 Hardware Interface 2 0 brown battery holder 2 1 2 2 white battery holder 2 3 no built in battery SquareWear Mini no built in battery Built in Components 2 0 2 1 2 2 Mini Mega328p 3 3V 12MHz with USBasp bootloader courtesy of USnoobie 2 3 Mega328p 3 3V 8MHz with Arduino bootloader compatible with Lilypad and Pro Mini 3 3V 250mA Linear Regulator LDO Lithium charging chip and charging indicator LED Temperature sensor TDR light sensor LDR Color RGB LED not on Mini Mini buzzer SMD tactile button power switch and JST connector for external lithium battery N MOSFETs for driving high current load LIR2032 rechargeable lithium coin battery 45mAh capacity not on 2 3 Mini 16KB I2C EEPROM not on 2 0 2 1 2 2 CH340 USB serial converter only available on 2 3 Power Options IMPORTANT Please READ SquareWear 2 0 2 1 2 2 have built in 45mAh rechargeable Lithium coin battery Every time you plug in the mini USB cable it charges the battery automatically Do NOT use it with non rechargeable batteries such as CR2032 You can also using an external LiPo battery such as http rayshobby net cart lipo 700 When 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 th
5. USBasp driver before you will need to install the Zadig driver Download the driver and during installation choose to install libusb win32 driver Linux 32 http rayshobby net software arduino 1 0 5 squarewear linux32 zip Linux 64 http rayshobby net software arduino 1 0 5 squarewear linux64 zip After installation run Arduino 1 0 5 from the installed folder Then select menu Tools gt Boards gt SquareWear 2 0 There are many provided example programs in File gt Examples gt SquareWear2 gt 2 Enter Bootloader on 2 0 2 1 2 2 Mini IMPORTANT PLEASE READ To upload a program first enter bootloader To do so plug in a mini USB cable to the USB port First turn off SquareWear i e turn power switch away from USB Then press the pushbutton while turning on the power switch and release the pushbutton within 1 2 seconds after the switch is on At this point the normal application will stop running and the controller will present itself as an USBasp programmer to the host computer Unlike the standard Arduino SquareWear 2 0 2 1 2 2 Mini do not appear as a serial port so no COM port or tty xxx Instead it bootloads into an USBasp programmer Check the video demo available at https www youtube com watch v mzAbWqQ7zLE Linux Users you need to run Arduino in sudo mode or create a rule in etc udev rules d except if using the VirtualBox image to give permission to USBasp 3 Upload Program to 2 0 2 1 2 2 Mini A
6. e battery up DO NOT force lifting the battery as it may break the battery holder The build in Lithium charger is set to charge at 35mA on 2 0 2 1 2 2 and 200mA on 2 3 Mini This will fully charge the coin battery in about 1 2 hour The time to fully charge external LiPo varies depending on capacity The green indicator LED will turn off when battery is fully charged SquareWear has a built in LDO providing regulated 3 3V up to 250mA 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 15 minutes before using it again SquareWear 2 2 2 3 has a VBAT battery pin which is connected to the battery s positive pin If your project requires high power you can use this pin to provide high current more than 250mA allowed by the LDO Keep battery plugged in at all times Certain functionality such as buzzer may not work properly if battery is removed Pin Names and Functions SquareWear uses the same pin names as Arduino o Digital I O Pins the board has 8 available digital I O pins D0 D1 also serial RX TX pin D3 D5 D6 support PWM MOSFET pins D10 D11 support PWM D13 internally wired to blue LED setting D13 high lights up the blue LED PWM Pulse Width Modulation also referred to as analog output provides adjustable level of voltage You can use PWM to control
7. es 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
8. fter you ve entered bootloader to upload a program click on the Upload button in Arduino Once the program is uploaded the microcontroller will start running the program immediately o If the Arduino output reports the following error avrdude error could not find USB device USBasp with vid 0x16c0 pid 0x5dc That means either the board fails to enter program mode or if you are in Linux you don t have system permission to use the USB device It may also be caused by low battery voltage o If the output reports the following warning avrdude warning cannot set sck period please check for usbasp firmware update avrdude error usbasp_transmit error sending control message Broken pipe It s n o rmal Just ignore them To upload a new program enter bootloader Step 2 again o Temperature Sensor According to the datasheet of MCP9700 if the temperature sensor reading analog value is A the temperature in Celsius is C A 3 25 1024 0 5 0 01 The conversion from Celsius to Fahrenheit is F C 32 5 9 Some SquareWears used MCP9701 and the equation is C A 3 25 1024 0 4 0 0195 o Using the SoftPWM Library The color LED is not wired to any hardware PWM pin so you cannot use analogWrite directly on the color LED But the SquareWear library includes a SoftPWM software PWM library that can simulate PWM on these LEDs To use the library you need to include both HIDSerial h and Soft
9. l 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 no more than 32 characters a time You can also Pause or Resume the device and host communication o Using Interrupts INT0 SquareWear 2 0 2 1 2 2 Mini Note INT0 D2 is available on SquareWear 2 3 The discussions below only apply to 2 0 2 1 2 2 Mini Because the HIDSerial library makes use of interrupt 0 INT0 or D2 you cannot use INT0 if HIDSerial h is included in your program The work around is to use interrupt 1 INT1 or D3 On SquareWear 2 2 Mini D3 can be used directly On 2 0 2 1 D3 is internally wired to a MOSFET to use INT1 you need to solder a wire from the Gate pin of the MOSFET and connect that to your interrupt source If you encounter a compilation error vector_x multiple definition do the following Open arduino 1 0 5 hardware arduino cores arduino WInterrupts c and comment out all ISR INT0_vect functions for example ISR INT0_vect if intFunc EXTERNAL_INT_2 intFunc EXTERNAL_INT_2 All other interrupts such as pin change interrupts timer interrupts all function as normal o Simulate Human Interface Devices HID SquareWear 2 0 2 1 2 2 Mini Because SquareWear 2 0 2 1 2 2 Mini us
10. 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 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 sound 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 x has 4 available analog input pins A2 also digital D16 A3 also digital D17 A4 also digital D18 and I2C SDA pin A5 also digital D19 and I2C SCL pin Analog pins are typically used to read analog signals such as sensor values They can also function as digital I O pins o Internally Assigns Pins not available for general purpose use D2 D7
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