CycleRecorder

Since my last update I've been experimenting with interfacing a Reed switch and a shock sensor to the ADuC7020; and reading a number of books.

The reed switch is just one that i've had in my parts box for a while, i've look at interfacing the switch through a GPIO pin to an IRQ and just sampling the pin status periodicaly form a Timer interrupt. I've also look the issue of debouncing, this articale gives a good overview.

The shock sensor is a PKS1-4A10 from muRata, this interfaces to the ADuC7020 through one of the Analog-to-digital converter (ADC) pins. This needs some more work there is almost no signal, I think I need to add a Operational amplifier (Opamp) between the sensor and the ADC.

This application note (The MAXQ Microcontroller in Action: Designing a Bicycle Computer with the MAXQ2000) from Maxim covers some of the same topics as this project.