I needed a device for measuring room temperature during nights to be sure my baby is warm enough all the time. Of course it would be better to have a full-fledged temperature data logger with fancy graphs and other stuff, but I wanted to do it fast and in a cost-efficient manner.
- stores temperature with 12-bit resolution,
- displays temperature in °C and °F,
- holds temperature measured in the past up to 12 hours,
- no buttons needed to operate.
- a Nokia 5110 display with a PCD8544 controller,
- a PIC16F628A microcontroller clocked at 4 MHz,
- a DS18B20 digital temperature sensor,
- a 3D printed PLA case,
- an old 5V power supply.
I do not plan to develop the project as it suffices my needs. Even if I decided to do so, it would be problematic with current hardware - the currently used program uses over 95% of program memory. It would be better to design a new device from scratch with a more capable microcontroller.