Alexa, table up!
Adjustable table desks are GREAT !
Protocol
- total 32 bits
- 1ms = 1 bit
- 23 fixed bits
- 8 height bits
- negated + reversed
- 1 check bit
10111111100111111111101 01001001 0
01001001 -> neg -> 10110110 -> reverse -> 01101101 = 109 cm
Motor
Raspberry
Controller
Arduino
Text
Raspberry
Text
So just connect wires, right? 🤩
NOPE
5V vs 3.3V
- Arduino 5 V
- Raspberry 3.3 V
- you need step up and step down level shifter curcuit
Step down/step up level curcuit
Driver in Typescript
- quick prototype
- nodejs is fast, right?
too SLOW
Driver in Rust
- worked reasonably well
- REST API for setting table height
- raspberry should be fast enough, right?
Not always
Alexa, table up!
Conclusion??
use Arduino for low level hardware operations
use proper tools 🔧
be lazy and don't wait for a table
Thank you
@martin_nuc
Martin Nuc
