Prototype concept
this prototype is developed in the branch "prot"
https://github.com/weinzmi/ergoFACE/tree/prot
- Reverse engineering of signals
- Analog simulation of SET POINT values
- safety/fail-safe compliance
- WATT program simulation
- Read / write values per webserver
- Logging of training data
| Items | shop | price | comment |
|---|---|---|---|
| DAUM Ergobike 8008 TRS | willhaben | €75 | electronics damaged !? |
| Osziloscope | amazon | €44 | for signal reverse engineering |
| Soldering kit | amazon | €23 | because everybody needs new tools |
| Maker starter kit | amazon | €40 | might come handy for other projects |
| Raspberry Pi 3 B+ | amazon | €40 | why not! |
| TOTAL | €222 | ok for a hobby ;) |
since the drive train board is supplied by a +5V signal, there is no need to "drive" this circuit from ergoFACE. To avoid signal problems, the GND (Ground) is connected from drive train board to the ergoFACE. The PWM signal for the electro magnetic brake will be simulated with the GPIO 18 (PIN12) and a LED
for specifications on signals, see Hardware the detection of RPM signal should work out of the box with 3,3V input of RPi. For the PWM signal, there has to be a voltage devider to scale down the 3,3V of RPi to the 2,5V of DAUM.
with 2 resistors, R1=100kOhm, R2=220kOhm, the output voltage of GPIO can be scaled down to 2,27V. Find a voltage devider tool here: https://www.electronicsplanet.ch/Spannungsteiler/spannungsteiler-berechnen.php
details on PWM: pwm.py
the GPIOs will be used to receive and send the analog signals via the connection cable
| Function | Parameter | Description |
|---|---|---|
| p = GPIO.PWM(pin, freq) | pin – pin number/GPIO number, freq – frequency of the PWM | Creates an PWM instance and assigns it to variable p |
| p.start(dutyCycle) | dutyCycle – Starting duty cycle | Values from 0.0 to 100.0 |
| p.ChangeFrequency(freq) | freq – new Frequency in Hertz | Changes the frequency of the PWM |
| p.ChangeDutyCycle(dutyCycle) | dutyCycle – new duty cycle Values from 0.0 to 100.0 | Changes the duty cycle of the PWM |
| p.stop() | none | Stops the PWM |
standard mode will be used, if there is an other wifi available,The ergoFACE and the mobile device have to be logged into the existing network. This will apply to the ethernet connection as well.
Hot spot mode will be used, if there is no other wifi available. The ergoFACE will create a hot spot and the smart device has to be logged into the ergoFACE wifi.
Setting up a Raspberry Pi as an access point in a standalone network (NAT)
MOLEX connector type
3901-3043 - Crimpgehäuse 4P - Molex
the connector will just be unplugged and bridged with cable extensions.
working on an installable package
- watt.py
for the purpose of failsafe and machine safety and getting the power data and duration from yaml files
- pwm.py
PWM output generation
- rpm.py
retrieving the rpm input signal
- machine.py
core of ergoFACE is the state machine
