The blue pill is very popular (and cheap), and I've spent this weekend porting the TCD1304 driver firmware to it. It's a less capable chip than the STM32F401, there are limits to the applications. Most importantly, it doesn't support integration times longer than 82 ms.

The specifications are:

• USB-connection
• MCLK of 800 kHz
• max t_int  is 2¹⁶ / 800 kHz = 82 ms

Pin-out is:

• OS - PA1
• ICG - PA10
• SH - PB4
• MCLK - PA15

The board attaches as a virtual com-port, so the usual tools work ie. the pyCCDGUI and the CLI (UART).

Everybody loves pictures, so:

Get it while it's hot. Go to tcd1304.wordpress.com