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AHTxx improved support for quick deep sleep #23339

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AHTxx improved support for quick deep sleep #23339

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8c8935a
AHTxx: remove unnecessary delay and tweak timing to be more compatibl…
dead1ne Apr 24, 2025
e312249
Merge branch 'arendst:development' into development
dead1ne Apr 24, 2025
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19 changes: 14 additions & 5 deletions tasmota/tasmota_xsns_sensor/xsns_63_aht1x.ino
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Original file line number Diff line number Diff line change
Expand Up @@ -83,7 +83,8 @@ struct {
bool write_ok = false;
uint8_t addresses[2] = { AHT1X_ADDR1, AHT1X_ADDR2 };
uint8_t count = 0;
uint8_t Pcount = 0;
// Pcount = 98 for quick initialization
uint8_t Pcount = 98;
} aht1x;

struct {
Expand All @@ -99,7 +100,8 @@ bool AHT1XWrite(uint8_t aht1x_idx) {
wire.write(AHTMeasureCmd, 3);
if (wire.endTransmission() != 0)
return false;
delay(AHT1X_MEAS_DELAY);
// not needed measure delay handled by loop timing
// delay(AHT1X_MEAS_DELAY);
return true;
}

Expand All @@ -124,13 +126,18 @@ bool AHT1XRead(uint8_t aht1x_idx) {

// Polling the device without delays
// Incompatible with other devices on I2C bus
// Poll device once every 10 seconds
// Function called every 100ms
// Pcount should be initialized to 98 for quick initialization
// Switch executes with Pcount 1-100 (100 times) and resets
// Write on Pcount 99 and read on Pcount 100 to update at the end of a 10s period
void AHT1XPoll(void) { // We have 100ms for read. Sensor needs 80-95 ms
aht1x.Pcount++;
switch (aht1x.Pcount) {
case 10:
case 99:
aht1x.write_ok = AHT1XWrite(0);
break;
case 11:
case 100:
if (aht1x.write_ok) AHT1XRead(0);
aht1x.Pcount = 0;
break;
Expand Down Expand Up @@ -210,7 +217,9 @@ bool Xsns63(uint32_t function)
}
else if (aht1x.count) {
switch (function) {
case FUNC_EVERY_SECOND:
// case FUNC_EVERY_SECOND:
// call every 100msec so read occurs 100msec after write
case FUNC_EVERY_100_MSECOND:
AHT1XPoll();
break;
case FUNC_JSON_APPEND:
Expand Down