The larger board contains power supplies, heater control and drive, signal conditioning, a three-digit 7-segment display, and a STMicroelectronics ARM STM32F3 Discovery board. The ARM computer is the green board. It will control the heater embedded in the plate and collect the sensor data during experiment runs.
The two yellow blocks connected by black cables to the larger board are receptacles for Lenovo laptop 20 Volt power supplies. The large black object is a heat sink for the heater drive.
The other photo shows the wiring on the back of this board. Although there are many soldered connections, most of the components are mounted on 16-pin DIP headers seen on the front side. These are plugged into prototyping sockets with insulation-displacement contacts. Connections made using 30 AWG wirewrap wire. This technology was sold by 3M in the 1990s. I don't think it is sold commercially any more.
