Thomas

Thanks for the links! I'll be looking into how LCD control works in the power supply once it's there.

Since the LCD hides the µC I'll have to disassemble the board I have. A second device is now in the mail. Help with reverse-engineering would be appreciated.

Just in the case: if anybody would like to see some progress on this board, just drop me a note here. It shouldn't be too hard to program a fan...

Hi @berrydejager, I have no knowledge of the code that defines the behavior of the ZFC39 as-is but you can, of course, program the µC on the board to any...

For reference: a specification document "4-Wire Pulse Width Modulation (PWM) Controlled Fans" from the Wayback Machine is here: [4_Wire_PWM_Spec.pdf](https://github.com/TG9541/stm8ef/files/3853906/4_Wire_PWM_Spec.pdf) In chapter 2.1.4 the specification requires the PWM frequency to be...

@dirkscheffer thanks for the schema :-) I've left this issue open because it appears to be useful to people looking for information on the ZFC39 fan speed controller. Currently this...

Approach: * connect logic analyzer to the following signals: `nSEL`, `SCLK`, `SDO`, `SDI`, `nIRQ`, `GPIO0`, and `GPIO1` * Establish connection to a 2nd HC12, and make recordings of the following...

@soyebean I had worked on the HC12 and I still have an experimental setup for analyzing the SPI communication between the radio chip and the STM8 in the basement but...

Analyzing that data is one of the problems: the datasheet assumes that one uses "Simplicity Studio" and I don't know of any decoder. The description above describes how I had...

 [DCDC-MH.sch.zip](https://github.com/TG9541/stm8ef/files/4007165/DCDC-MH.sch.zip)