ProgArm 0.4

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Undecided / Todo / Done

Current stage:

planning -> schematic -> components -> PCB -> waiting for PCBs -> testing

Ideas

• Use stm32L to improve Power Consumption.
• BMX055 instead of MPU9250.
• Redefine concept.
• Use resistor arrays.
• Use dual mosfets (6-pin SOTs).
• Redesign power system.
• Test points for I²C and SPI.
• 4.7kΩ pull-up resistors instead of 4.7kΩ.
• Consider using ARM MCU with onboard BLE frontend (i.e. freescale).
• Make sure 5v-tolerant pins are used where off-state current leakage is important. These pins lack protection diodes. (as for STM32)
• nRF52832 - New chip from nRF, loads of support from Adafruit, Cortex-M4, also ON-CHIP BALUN!!!!!
• Use Surgu to produce waterproof version of the Ring