After reading more posts about the severely restricted availability of RPi Zero, my conclusion is to use RPi 3A+. This will increase the BOM cost about USD 15 ($10 more for RPi A comparing to ESP32+RPi Zero, and $5 more for a 3A 5V power adapter (comparing to a 1A power adapter)). This will make the...

drgeoff wrote: ↑

Thu Feb 28, 2019 12:37 pm

chitester wrote: ↑

Thu Feb 28, 2019 10:53 am

If I use ESP32 (FCC certified as modular) as a WiFi module for RPi Zero, the cost for both boards are still below USD 10.

The RPi Zero is not available in quantity at a unit price equal to or below US$5.

You are right. Some distributors forced me to buy their kits. This is a real problem.

The RPi Zero with on-board WiFi is a better option. Keep the esp32 as a remote sensor driver that can publish on an MQTT topic. It is a better technical option but not for business purpose. Because RPi Zero with on-board WiFi is not FCC certified as a modular. I will make my own PCB. This means tha...

Want to seek recommendations from the forum about developing a low cost IOT device. The IOT device needs to have a HDMI port and WiFi, and to be produced as lowest cost as possible. RPi Zero W should be the ideal candidate. But unfortunately, for whatever reasons, RPi Zero W is not FCC certified as ...

I found TFA9882 from NXP, https://www.mouser.com/datasheet/2/302/ ... 127930.pdf. Is a perfect replacement for MAX98357A? It is about 40% cheaper than MAX98357A.