Attended: May Chen, Kristie Lee, Jon Liang

• How to select an SD card reader?
  • Will be connected from MCU → SD card w/ hub
  • Uneven solder pad layout can be made uniform approximately, as long as contact is made
  • Look at number of positions and match it with SD card being used
  • Look at datasheet to see what each pin does
    • Power, ground
    • Data pins
    • Receive, transmit, other communication
• Does it need supporting parts?
  • Resistors, capacitors, clock?
• Software
  • How does it communicate?
  • What pin to connect on the MCU to SD card reader to store data, etc.
  • Receive, transmit, gnd, pwr, other communication
• Leave unused pins open

• Programmer
  • Ask Dragonfruit/Cranberry how their MCU gets programmed?
    • We will use the same circuit and program it the same way b/c same MCU
  • Ask Apple what is on the receiving end of the Arduino (silver usb programmer thing)
    • Put that on our board
  • Look at schematic/datasheet of Arduino to see how its usb programmer connects to the MCU
    • Match the pins to our programmer
  • Same programmer can be used to program apple and program our chip
• We’re basically making a “baby Arduino”

• Communication system
• VB send request to Apple
• Apple send request to sensors
• Then repeat backwards
• Atmega has back and forth communication with sd card, not one way

• Power system
  • Use terminal block
    • One to connect to power supply wires
    • One to mount on our board
  • Power with power supply, not battery b/c for bench testing
  • Switch
    • Ask Dragonfruit what kind switch they’re using
  • Voltage regulator
    • Need 5V and 3.3V?
    • Cascading: pass through switch, connect highest voltage signals, then go down lower
      • Eg. switch.. 10v reg… component that needs 10v… 5v reg… component that needs 5v… 3.3v reg… etc.
  • How are we powering Apple?

• Find parts for SD card reader, programmer, and switch
• Look at Arduino datasheet
• Talk to Apple, Cranberry, Dragonfruit about parts

• Poster ready to be reviewed by Kenny/Christie

Contributing authors:

Created by leekrist on 2015/12/05 05:31.