Ergware

ErgWare is an open source hardware/software platform for DIY ergometers. All of the source code is hosted here and the project itself is fully documented at my project page.

v0.1

• initial release
• source code for ATMEGA328
• pdf w/ circuit diagram and chopper details
• pdf w/ details of the screenshots
• excel spreadsheet with analytical model & data from actual erg
• included ./v0.11_stroke_debug/ which when compiled will dump stroke data to EEPROM. You can then read out the EEPROM data & put it into spreadsheet erg_model3.xlsx which will allow you to calculate the d_omega_div_omega2 constant for your erg & to set the correct "screening" values.

v0.2

• rewritten using Chibios/Nil RTOS
• added calorie counter, timers and pacers
• updated fonts

v0.3

• updated button-press detection algorithm to be more robust
• drastically simplified RTOS code
• updated thread table
• added a splash screen
• first flash the binary (main.hex) to add the font table in eeprom
• then flash program binary (nil.hex)

v0.4

• code to work w/ Arduino UNO rev3 without a bootloader installed
• "*.hex" files ... cannot be programmed/flashed from usual Arduino environment
• A pdf with detailed setup & build instructions are in the v0.4 folder
• same as v0.3 except assumes 16MHz external clock (& Atmega328)
• use 3.3V from arduino on LCD_Vcc
• first flash the eeprom save binary (main.hex) to add the font table in eeprom
• then flash the main program binary (nil.hex)

v0.5

• code to work with a "regular" Arduino UNO rev3
• *.ino files ... a "sketch" can be uploaded from usual "Arduino" environment
• A pdf with detailed setup & build instructions are in the v0.5 folder
• NOTE: you still MUST access the board over ISP to set the EESAVE fuse (see instructions), so you will need an external programmer (like stk500, usbasp, ponyprog, another UNO board, etc...)
• same as v0.3 except assumes 16MHz external clock (& Atmega328)
• use 3.3V from arduino on LCD_Vcc
• first set the EESAVE fuse
• next program the EEPROM (eeprom_burn.ino) to add the font table in eeprom
• then program the main program program binary (main.ino)

v0.6

• Added an app (Fx) to display the "force curve" at each stroke
• Implements a more robust stroke count algorithm
• Includes a "sketch" version for Arduino UNO boards that can be programmed from Arduino environment
• assumes 16MHz crystal/clock
• see pdf for screenshot of the force curve

TO USE THIS:

1. Build your erg ... openergo.webs.com
2. Build the chopper wheel & attach the sensor ... see pdf
3. Customize your sensor interface circuit if needed ... get a logic level signal into PD2 of ATMEGA328 ... see pdf
4. Build the circuit ... see pdf
5. Measure or estimate flywheel moment of inertia & add to source code ... will make your numbers more accurate, see main.c
6. Compile code & flash ... see makefile
7. [Optional] compile a ./v0.1/v0.11_stroke_debug/main.c to measure the d_omega_div_omega2 value for your erg to put in the source code as well as the screening values which identify the compoenent parts of the stroke (catch, drive, release, recovery) . This will make your numbers more accurate. The excel sheet ./v0.1/v0.11_stroke_debug/erg_model3.xlsx has data from 2 very different ergs that ErgWare is currently running on along with instructions on how to use it.
8. Have fun!

Dave Vernooy
Niskayuna, NY
January 2017