last updated: August 1, 2014
- Minimal bike modifications – it should only take minutes to put the bike back in it’s original condition
- Light – it shouldn’t be that hard to carry
The display shows the following information
- Speed (km/hr.)
- Distance remaining under current conditions (km)
Valid only when speed, power and peddling effort is steady
- Power comsumption (Watts)
- Odometer (km)
- State of charge based on coulombs used (%)
- State of charge based on voltage (%)
- Amp-hours used so far
There are a variety of other values available to be displayed, but they’re not that important and there’s only so much room on the LCD.
Here’s the source code (Aug. 1, 2014)
- Microcontroller (PIC 18F2620)
- Current sensor (Allegro ACS756).
- 5V switching power supply
- Hall effect sensor
24V, 1200 RPM, DC, brushed, 4″D, 6″L, very heavy. I’d like to get a better one.
There is a 9 tooth sprocket on the motor and 32 on the wheel.
- batteries: $300 for 2 sets, includes $100 for shipping
- motor control: $150
- sprocket: $20 including shipping and other costs
- chain: $12
The rest of the parts I had lying around