CycleOps Pro300 PT to ANT+, Part 6, Update on V2

I’ve received a few emails asking about buying or for help making the Pro300 PT to ANT+ adapter. I wanted to be as candid as possible and say that I would like to complete the development of version 2 before producing any more PRO300 PT to ANT+ adapters.  The primary reason for the V2 is to address the limited memory that is available in with the ATmega32U4 processor.

As I wrote the current code, The Adafruit_GFX and Adafruit_SSD1306 libraries used to drive the OLED display are rather memory intensive.  I found myself resorting to various tricks to get the memory usage of the ANT+ code as small as possible to get the system to run without issues. This did lead me to the neat F() syntax for storing strings in flash memory rather than RAM.

With a basic working system behind me it’s time to switch processors and compile all of my learning into the V2 board. I chose to stay within the Arduino ecosystem as the abundant well tested libraries makes development far easier than when I use to work in CCS PIC.

Processor comparison

 Pro Micro
ATmega32U4
ESP8266
Program Memory Size (KB)324194 (external flash)
CPU Speed (MIPS/DMIPS)8 (3.3V)80
USB OutputYesNo
Estimated Cost$4.50$2.00

The built in WiFi is a nice addition i’m sure I will find uses for in time. I have plans of turning the Pro300 PT into a smart bike and controlling it via FE-C (Torque control method TBD). I have working software on the V1 prototype board without the OLED display but ran into memory limitation as I tried to pull it all together. Leading down the current path of moving to a new processor.

 

First Post

I’m going to try to use this word press site as a way of documenting my projects. First step find a good location to post ZIP files for all the PCB circuits (eagle CAD) and other file types that wordpress doesn’t seem to support. I could try to use my dropbox account but I would end up just deleating the files at some point later by accident.

I would like to document some of my past projects first, so things to come

  • Folding wings made for Burning Man 2009
  • Dumb LED coat made for Burning Man 2010
  • Simple home made Li-Ion 3 cell charger
  • -Work in Progress, Smart LED coat for Burning Man 2011

Let the fun begin

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