An ST-Link ?
Nope it's next derivative, St-link were for long into C6T6 with 32Kilo byte long. Today acquired st-link to upload a factory default let you receive code from PA9 + PA10 Pin are 128 Kilo Byte version call ST32103fCBT6. Like the WeAct compagny hold couple of them into the retail market it's likely to offer a lot of space to enjoy complex fuzzy learning. Some day maybe a full night sleep !
Here the image, coding Arduino on it sing the simple pair of Pin PA9 + PA10 with an good FTDI like a cheap one on alieexpress, make it possible to run the 1.3 SH1106 screen and a ECPR11 rotary wheel to make it possible to add several graphic to the design. Can accept many pin in ISR for wide number of available working pin it's good way to make plenty of test with several tools costing by to overpass the Serial terminal as throughput channel make it possible to output on screen with several image to enhance the coding. It's calling coding on a Blue Pill.
Here at the left the ST32F103C8T6 with 64 Kilo Byte of ROM to add your functionality. Appear in 2007 it's an almost 20 years of presence. And essentially be under the 7$. This one will probably hold the control motor and a I2C slave to receive command about changing the PWM level of motor and the pelletier. Testing for several hours it keep running and make it possible to be a good choice for holding the command and performing the cooling and retrieve from it's memory the received command.
About Where
Like many computer cooler with only indicative information into an high color look. But only for OLED they are black and white, so honest startup and resume and the grip from the Easterdyn DIY module with 128x64 pixel and a rotary. This one over the top of the cpu cooling in between the metal binder and the cooler. If it fit all because I guess using a 8 channel multiplexer to read up to 8 others thermals sensors and having the opto coupler to start the computer can be a rotary action upon powering the cooler first prior to start the computer and itself latch the conductive side of an opto-coupler will do the job.
