![]() ![]() arduino mega - Using SPI and 2 shift registers WITHOUT libraries - Arduino Stack. ![]() I can get it to print out the data once but then I think it is having issues resetting the receive interrupt because it is expecting an interactive master. Before start programming for SPI communication between two Arduinos. Each bit in the Control Register controls a specific aspect of SPI. This was promising but it's been alot of work stripping it down to what I want. Three registers are used for the SPI interface. You could attach this to a PWM capable Arduino pin and use 'analogWrite' to control the brightness of the LEDs. ![]() The chip also has an OE (output enable) pin, this is used to enable or disable the outputs all at once. SPI.transfer(0x00) //00 00 11 01 08 01 08 02 02 00 00 0C 67 66 80ĭoes anyone have any idea on how to make a simple SPI slave on esp? Or is there a better way to sniff this shift register bus? The clock signal is 1 MHZ so it isn't terribly fast. This is necessary, otherwise the wrong LEDs would flicker as the data was being loaded into the shift register. It was enough to debug my code :) Of cause you. Here is the code for the Arduino Pro mini so it can emulate the washer signals: // SPI master code for Arduino Pro Mini "washing machine clone" 1.As my goal only to demonstrate different approaches I connected to LEDs only 4 out of 8 outputs of 74HC595. Writing an SPI master is relatively easy but the slave is the hard part. I have been able to successfully read the signals using a logic analyzer and even made a script for an arduino pro mini that emulates the register signals so that I can more easily debug my ESP12 without running the washer all day. The reason I want to control the shift register using SPI is because I already have 2 other SPI devices, so it would save me pins. My first thought was to use a custom shiftin but I had no luck with that (and supposedly digitalread() is too slow anyway) and I was reading everywhere that I should "just use SPI" since it's faster. Control CD54HC4094 (Shift Register) with SPI. If I can read the signals going to the LED drivers, I can determine which bits are for which LED and then determine status in my program. I am trying to get status from my washing machine like time left, which cycle, check if its done, etc. The registers are STP16CPC05 which also happen to be LED drivers. At same time I am wondering what is the point of using SPI since on the schematics I saw over the internet requires to link the 595s chips via their Serial. I am trying to decode the signals going to shift registers in my washing machine. This is the tutorial I use to understand shift registers : and the one that uses SPI is nXl4fbLbcI I am now aware that I should get one resistor for each LED but I don't have that much resistors and as far as I can see this don't harm my LEDs nor underpower them. ![]()
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