What is it and why use it? It is Arduino compatible ATmega 328P micro controller development board with PCA9685 16 channel pulse width modulation controller ic. It can be used for all sorts of LED ...Read More…
It is Arduino compatible ATmega 328P micro controller development board with PCA9685 16 channel pulse width modulation controller ic. It can be used for all sorts of LED lighting and servo motor controller applications. It takes much less space than full sized Arduino kit with PWM shield. It is built on four layer PCB and measures just 7.5 x 4.5 cm - about the size of a credit card.
PCA9685 is controlled using I2C connection that is hardwired to micro controller. Additional I2C devices can be connected as well. On board there are 16 PWM connectors using 3 pin servo motor style connectors. PCA9685 outputs can be configured as push/pull or open drain outputs for more specific applications. All Arduino pins are available as well and are labeled according to pin names. Note that micro controller runs at 3.3V and Arduino input pins can not use 5V input levels.
Board can be powered form 5 – 15 V DC input (barrel jack plug or screw in terminal). Same DC voltage will be used for powering servos or leds. It is possible to use any voltage in this range for servos or LEDs. Onboard 3.3V regulator provides voltage for micro controller and PWM ic.
Micro controller runs at 3.3V volts and uses 8 Mhz oscillator as clock source. There is 6-pin ICSP connector and FTDI style USB to serial breakout board connector. There is no USB to serial converter on board. Input level shifters are used for serial and ICSP connections so it is possible to use any 5V USB to serial adapter or AVR programmer.
Additional USB to serial breakout board is needed for reprogramming from Arduino IDE or using serial console. It is possible to use any USB to serial adapter that uses compatible 6 pin connection. Connector for serial breakout board uses female header. Matching FTDI breakout boards are available as option.
Micro controller is flashed with Arduino bootloader with blank sketch. Board will be delivered with all pin headers soldered as seen on pictures. If you prefer something else for pin connections let me know. It might be possible to arrange according to what is available. There is space for additional power supply capacitor that is not soldered in.
Full schematic will be supplied and some more technical notes. If you have any specific question, use contact form to get in touch.
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Tinkering with electronics and PCB design