Build your own IoT/MQTT node for less than $2 • Hacker News Board

Re: Build your own IoT/MQTT node for less than $2

#41

Post by JshWright » Tue, Jan 01, 2019, 9:10 PM UTC

NicoJuicy wrote: post #26

I recently found out about Sonoff-Tasmota ( https://github.com/arendst/Sonoff-Tasmota ), i hate it. Because now i bought for 300 € of Sonoff products for home-automation based on the MQTT protocol. (The project allows you to flash the Sonoff products with custom firmware) They also have an IR module, for customizing your remote. Anyone else has other ideas that are similar for home automation without adjusting your e…

Yeah, but on the plus side, if you were buying "polished" products, 300 € would get you a hub and two lightbulbs...

Re: Build your own IoT/MQTT node for less than $2

#42

Post by drudru11 » Tue, Jan 01, 2019, 10:43 PM UTC

This is interesting. What chip do ESP12F's have for USB?

I did a quick search and nothing came up. Most ESP8266 projects refer to the node mcu board rather than the module. Those boards usually have a USB serial chip.

Re: Build your own IoT/MQTT node for less than $2

#43

Post by beardyw » Wed, Jan 02, 2019, 5:20 PM UTC

general8bitso wrote: post #37

samstave wrote: post #21

Earlier quoted context omitted.

Ahh - so coupled with whatever sensor you have, you can have a wifi broadcast capability at extreme low cost... So, ostensibly - if you have these all participate in an SSID of e.g. "sensors", then you can place these all over and have a low-cost mechanism to deliver the reads to your (already) existing wifi infra... So the key, then, is the family of sensor types you want to place on them. The limitations in the cas…

Battery depends more on what you are doing. Most boards and sensors use either 5 or 3.3 volts DC. You can put the device in a sleep or hibernate mode and have it only connect to wifi periodically or when triggered. Also, using encryption, like WPA2 increases battery use.

The esp8266 module itself runs at 3.3V but seems happy with a couple of AA batteries. Tried with CR3032 but it can't deliver enough current. After all, it is doing WiFi.

Re: Build your own IoT/MQTT node for less than $2

#44

Post by general8bitso » Wed, Jan 02, 2019, 11:28 PM UTC

beardyw wrote: post #43

general8bitso wrote: post #37

Earlier quoted context omitted.

Battery depends more on what you are doing. Most boards and sensors use either 5 or 3.3 volts DC. You can put the device in a sleep or hibernate mode and have it only connect to wifi periodically or when triggered. Also, using encryption, like WPA2 increases battery use.

The esp8266 module itself runs at 3.3V but seems happy with a couple of AA batteries. Tried with CR3032 but it can't deliver enough current. After all, it is doing WiFi.

Google ‘joule thief’.