[Heltec Wifi LoRa 32 birdseye 500x366] For the first part of this topic see: BIG ESP32 / SX127x topic part 1 For updates to below start topic see: Big ESP32 + SX127x topic part 3 The ESP32 microcontroller and SX127x / RFM9x LoRa transceivers The ESP32 has built-in support for Wifi and Bluetooth c…

Be careful with connecting a battery, did you see the warnings above?

In the TTGO v1.6 design power from USB and battery runs over a diode (at least it should, when the did not accidently used a fuse). That means that we give about 0,1 Watt of power at this early point in heat, even before it arrives at any circuit… :frowning:

Hi all, Been trying to use a 18650 rechargeable lithium ion battery with my TTGO ESP32 SX1276 microcontroller and not having much luck. TTGO does not seem to want to be powered by the battery. From my understanding I thought that if you plug in the TTGO via micro USB it simply charged the battery …

to lower the consumption it is necessary to review the hardware very well, to be able to lower the consumptions.

[image] ElectronicallyE: From my understanding I thought that if you plug in the TTGO via micro USB it simply charged the battery and you are good to go Which version of the board are you using? Beware: [image] Verkehrsrot: Attention users of TTGO21 v1.6 (boards labeled “T3_V1.6” on pcb)…

My board isn’t the 1.6v-v2.1. It has no indication of the model on it. The link I supplied above shows a board identical to mine, excluding the OLED. I’ll try charging the battery again to see if I didn’t charge it long enough. How long do I need to leave it for if I do so?

[image] ElectronicallyE: I’ll try charging the battery again to see if I didn’t charge it long enough. How long do I need to leave it for if I do so? Just in case its one of the ‘faulty’ ones, I would not leave it at all. Monitor the battery voltage with a multimeter, that will give you an i…

Sounds like a plan! Just interested… What are the operating voltages used for the TTGO when connected to the battery? I guess it’s 4.2V at a max, but how low can this drop to and still allow the board to operate?

Well, the ESP32 processor and LoRa device are 3.3V devices …

Very interesting testing I just did… it seems that the TTGO does not light up it’s LED when connected to battery. Anyone else had the same experience? Now that is why I didn’t think it was working before, because I thought it was off.

Need professional support?

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Big ESP32 + SX127x topic part 2

End Devices (Nodes)

rodri16 (Rodri16) October 4, 2018, 12:36pm 845

It would be great @BoRRoZ , adding Heltec v2 and TTGO T-Beam