Digital Lap Timer Update - 10/3/07
Ryan and I have been working on a lap timer for our contests in October. The timer uses the Chibot controller with a Mega88 MCU, runs on 4 AA batteries (alkaline or rechargeable) and supports 3 sensors. It is designed for 3 modes:
1. Lap Timer - Time on 3 individual laps and a total time
2. Start/Finish Timer - Captures the time between trigger the Start sensor and the Finish Sensor
3. Lap Timer with Speed Trap - Works like the Lap Timer with the addition of measuring the speed of robot as it passes over a pair of sensors embedded in the track (this mode is not fully baked yet)
Two sets of wireless sensors are complete. The sensors use the Laipac 433MHz ASK transmitter/receiver pair, 1 RF transmitter in each IR receiver and a single RF receiver in the timer. The ASK transmitter is active only when a high signal is sent. This allows two transmitters at the same frequency to be used with one receiver.
|LCD||4x20 White on Blue with Backlight|
|Controller||Chibot Controller with Mega88 MCU running @ 20MHz|
|Power||4 AA/DC adapter, DC-DC converter with Soft Switch|
|UI||3 Buttons: Mode, Start, Reset|
Still To Do:
- Enable Auto Off when there is no activity for a set amount of time
- Low Battery Alert
I picked up a carrying case for it from Plasticase. This will keep the timer from getting scratched up and make it easier ot carry.