After talking with Chinese suppliers to negotiated down to 1.5 USD per ESP 12F module, the cost to build an internet-connected relay is nearly within the sub $2 paradigm.
- A 10A 110-220V Songle brand 5 pin relay costs .17-.18 USD (after negotiation)
- A AC 95-220V to AC 5-25V constant current LED driver can be purchased for .35 USD (after negotiation)
- A suitable capacitor to smooth the AC output is 0.01-.05 USD (Caps are tricky business)
- A liner voltage regulator to step the smoothed AC (now DC) down to clean 3.3V (for the ESP) is .01-.03 USD
1.5 (still trying to get lower)+.17+.35+.02+.02= 2.06 USD!!! to build a Gohst.Host
While this is the price at 1000pcs the total could come down to as low as 1.5 USD with higher volume and a dedicated PCB.
Here is the original Gohst.Host prototype:
For industrial versions the Gohst.Host could be potted (with thermally conductive potting mixture) and the relay could be swapped for a 10-25-30-45-50-100A or Variable speed module
The sensing capabilities are endless.
Any sensor compatible with the Arduino is usable with the Gohst.Host.
Future improvements to the Gohst.Host include an optoisolator between the ESP 12F and the relay and a low cost ac-dc 5v buck converter integrated design (possible integrated triac design also on the way;).
Shoot for the Stars and you will Land on Mars!- Bp
