Home
IoTuz is a hardware project originally constructed for the Open Hardware Miniconf 2017, which is being held as part of LCA2017
- Hardware Assembly Instructions
- Software Setup Instructions
- IoTuZ Schematic PDF
- Datasheets for onboard devices
(Ordered by edge connector pin, left to right.)
| IO | Connected To | Type of Signal |
|---|---|---|
| 39 | Joystick Y signal | Analog |
| 36 | Rotary encoder B | Digital In |
| 34 | Joystick X signal | Analog |
| 27 | ADC out ????????? | Analog |
| 32 | LCD Reset pin | Digital Out |
| 26 | IR Transmit | Digital Out |
| 14 | SPI CLK | SPI |
| 25 | I/O Expander Interrupt | Digital In |
| 35 | IR Receive | Digital In |
| 33 | Spare GPIO Pin | Any Use |
| 12 | SPI MISO | SPI |
| 13 | SPI MOSI | SPI |
| 9 | SD2 (Internal SPI bus) | Internal SPI |
| 15 | Rotary encoder A | Digital In |
| 2 | Battery level | Analog In |
| 0 | Joystick button | Digital In |
| 4 | LCD D/C Signal | Digital Out |
| 16 | I2S MCLK | I2S |
| 17 | I2S DAC IN | I2S |
| 5 | I2S DCLK | I2S |
| 18 | I2S FS | I2S |
| 19 | LCD CS | SPI |
| 23 | RGB LED Data (APA106) | Digital Out |
| 22 | I2C SCL | I2C |
| 21 | I2C SCK | I2C |
| 1 | UART Receive | Serial UART |
| 3 | UART Transmit | Serial UART |
| I2C Address | Device | Part | Datasheet |
|---|---|---|---|
| 0x1A | I2S codec | NAU8814 | NAU8814 PDF |
| 0x20 | I/O Expander | PCF8574 | PDF8574 PDF |
| 0x53 | Accelerometer | ADXL345 | ADXL345 PDF |
| 0x77 | Temp/Humidity/Pressure | BME280 | BME280 PDF |
PCF8574 I/O expander, connected to I2C bus (address 0x20)
| IO | Connected To | Type of Signal |
|---|---|---|
| 0 | ADXL345 Interrupt (INT) | Digital In |
| 1 | Button A | Digital In |
| 2 | Button B | Digital In |
| 3 | Rotary encoder button | Digital In |
| 4 | SD Card CS Signal | Digital Out/SPI |
| 5 | Touch Screen Interrupt | Digital In |
| 6 | Touch Screen CS Signal | Digital Out/SPI |
| 7 | LCD Backlight On | Digital Out |
NAU8814 I2S codec, configured over I2C bus and connected for data streaming over I2S bus.
| Connection | Is | Goes To |
|---|---|---|
| SPKOUT | Amplified speaker out | Speaker footprint on PCB |
| mout | Mono line out | MonoOut Edge connector pin |
| MICBias/MIC- | Microphone | Microphone footprint on PCB |
| AUX | Aux line in | AUX Edge connector pin |
(Note: schematic shows a 3.5mm jack but this was unfortunately left off the PCB.)