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Published 20 hours ago • verified publisher icon Xinyuan-LilyGO

Battery charge %

Open alfwro13 opened this issue 1 year ago • 6 comments

Hi, I have LILYGO® TTGO T5 V2.3 2.13 Inch E-Paper Screen and I have connected 3.7v 300mAh battery to the onboad battery connector. I can see that on the board text written next to the battery connector BAT_TEST_35. What is it and can I use that to calculate battery % charge?

alfwro13 avatar Sep 19 '22 15:09 alfwro13

Yes, IO35 can collect battery voltage

lewisxhe avatar Sep 21 '22 09:09 lewisxhe

and is there a way to calculate the battery % charge ?

alfwro13 avatar Sep 26 '22 10:09 alfwro13

You can refer to this code

https://github.com/lewisxhe/XPowersLib/blob/master/src/XPowersAXP192.tpp#L1441-L1441

lewisxhe avatar Sep 28 '22 13:09 lewisxhe

float voltage = analogRead(35) / 4096.0 * 7.46; uint8_t percentage = 100; if (voltage > 1) { // Only display if there is a valid reading Serial.println("Voltage = " + String(voltage)); percentage = 2836.9625 * pow(voltage, 4) - 43987.4889 * pow(voltage, 3) + 255233.8134 * pow(voltage, 2) - 656689.7123 * voltage + 632041.7303; if (voltage >= 4.20) percentage = 100; if (voltage <= 3.50) percentage = 0; Serial.println("Percentage = " + String(percentage)); }

BatsIhor avatar Dec 07 '22 15:12 BatsIhor

@lewisxhe I checked your link but it's not clear how to use XPowerLib and what is the purpose of it. Do you have any documentation on what it is and when to use it? I was not able to find anything on the internet yet.

BatsIhor avatar Sep 05 '23 20:09 BatsIhor

No, I'm just giving you a rough calculation of the percentage. Although it's not accurate, it can achieve the desired effect.

lewisxhe avatar Sep 06 '23 02:09 lewisxhe