last updated: June 22, 2021
- 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.)
- Time of day
- Distance remaining under current conditions (km)
Valid only when speed, power and peddling effort is steady
- Power consumption (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 (June, 2021)
- Arduino Nano clone
- Current sensor (Allegro ACS756).
- 5V switching power supply
- Hall effect sensor
- real time clock
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 33 on the wheel.
3 10 amp-hour Lithium Iron Sulfide batteries from . They are 4 cell. Total voltage ranges from 42V to 30V.
- batteries: $270 for 3
- motor control: $150
- upper sprocket: $20 including shipping and other costs
- lower sprocket: $40
- chain: $12
The rest of the parts I had lying around