20140618_log

#### Wed Jun 18 11:00:13 BST 2014

- Setting up bench

#### Wed Jun 18 11:25:17 BST 2014

- Testing servo on both models (connected to VBAT)
    - No problems encountered
- Testing servo + stepper
    - RPIO module has problems running both at once (not a HW issue)
    - But, using the lower-level API, ran both at once without issues
- Testing servo + stepper on battery
    - No issues

#### Wed Jun 18 11:53:55 BST 2014

- Looking at making design changes

#### Wed Jun 18 12:29:20 BST 2014

- Looking at firmware DC-motor issue
- Programming firmware with constant speed
    - encountered programming issues: resolved through removing motor connections and re-plugging programmer
    - no other issues: points to a comms problem
    - more programming issues: resolved through re-plugging programmer
    - encountered issue of not being able to power pi: everything turns off, short circuit?
        - attempted to power pi directly: no issues
        - re-connected pi and pibot-board: resets repeatedly on start
        - model-b pi has developed issue starting on either pibot-board, still starts fine of 5V direct
        - model-a does not have this issue

#### Wed Jun 18 14:04:03 BST 2014

- model-b power-up issue resolved by changing input from 5V: DC-DC cannot operate as 5V in to 5V out, needs to be different
- looking at firmware motor issue again
    - attaching UART cable and printing SPI to UART
        - servo moves when attaching serial and USB debounce fails
            - adding pull-up (4k7) on servo data line (up to 3v): servo jumps around less, still works
            - trying 10k pull-up: OK
                - adding pull-up to design
        - SPI is constantly reading 0 for all values unless written to