We believe the most significant risks currently involve getting the custom PCBs in on time and getting the wireless charging current high enough. We would like to have a 50mA charging current minimum, which would hopefully reach our target of under 8 hours charging time with buffer to spare. However, our current charging capabilities of < 1mA would mean that charging the battery to full would take astronomically long. Like last week, our backup plan if the PCBs do not get here on time, is to use one of the SEEEDs as a central receiver. For the charger, our backup plan is to use the USB port attached to a wireless charging pad.
There were some changes to the wireless charging setup, which are documented in Zhejia’s individual status report. This change was necessary to reach the minimum charging voltage on the SEEED. This does not incur many additional costs, as we still need to design the custom PCBs.
Our schedule remains unchanged.
Wireless working: