I've uploaded a zipped copy of the EasyEDA project that you can use to look at the project so far.

So what I have is this // inslude the SPI library: include / digital pin 04 (SD Card SS pin) digital pin 08 (Input SS pin) 74HC165 digital pin 09 (Output SS pin) 74HC595 digital pin 10 (Ethernet SS pin.

It already has the ICSP header (for programming using something like an USBASP v2.0) and Serial header (for the USB-to-Serial adapter). I am automating a frog tank and am wanting to use 2 74HC165’s for the sensor input and 2 74HC565 for the motor and light control. It now breaks out the additional SPI bus, as well as the original I2C bus. If a callback is specified it will be called once for each pin level change. readspersecond is the number of readings to be made per second (defaults to 100). chips is the number of SN74HC165 being used (defaults to 1). However, if it does get set then it probably means that the PC has pulled the AVRs SPI chip select low and transmitted a byte to it. SPIdevice is either MAINSPI (default) or AUXSPI. Let me know how you would change this PCB (which has already changed since the video was made). SLLD is the GPIO connected to the shift/load pin of the shift register.

For a full list of all the differences see the detailed spec sheet in the GitHub! I need your help! and we can use EITHER an ATMega328P (as found in all Arduino UNO and Nanos) OR the newer ATMEGA328PB which has an additional SPI and I2C bus, plus an extra USART.

This project started life as a simple replacement timer for my toothbrush, now it's a universal timer with various options.Ī simple 2 minute timer project has turned into a universal timer with DIP switches, a 74HC165 chip that allows you to read 8 switches and put the value on the SPI bus, a beeper, an LED. Universal Timer ATMega328PB 74HC165 Shift-Register $2 for PCB Prototype ( Any Colour): See video #161 (Direct link to video: )Ī Universal Timer (or whatever you want) using an ATMega328PB (yes, PB not P) and a simple chip on the SPI bus - easy!

74hc165 hardware spi atmega