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Merge pull request #7874 from device111/development

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Add comment that AHT10 is incompatible with other I2C devices
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Theo Arends 2020-03-08 15:43:33 +01:00 committed by GitHub
commit b14c72e1d4
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1 changed files with 14 additions and 5 deletions
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19
tasmota/xsns_63_aht1x.ino
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@ -15,6 +15,7 @@
You should have received a copy of the GNU General Public License You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. along with this program. If not, see <http://www.gnu.org/licenses/>.
*/ */
#ifdef USE_I2C #ifdef USE_I2C
@ -23,6 +24,15 @@
* AHT10/15 - Temperature and Humidity * AHT10/15 - Temperature and Humidity
* *
* I2C Address: 0x38 * I2C Address: 0x38
*
* Attention: this Sensor is incompatible with other I2C devices on I2C bus.
*
* The Datasheet write:
* "Only a single AHT10 can be connected to the I2C bus and no other I2C
* devices can be connected".
*
* after lot of search and tests, now is confirmed that works only reliable with one sensor
* on I2C Bus
\*********************************************************************************************/ \*********************************************************************************************/
#define XSNS_63 63 #define XSNS_63 63
@ -31,7 +41,6 @@
#define AHT10_ADDR 0x38 #define AHT10_ADDR 0x38
uint8_t eSensorCalibrateCmd[3] = {0xE1, 0x08, 0x00}; uint8_t eSensorCalibrateCmd[3] = {0xE1, 0x08, 0x00};
uint8_t eSensorNormalCmd[3] = {0xA8, 0x00, 0x00};
uint8_t eSensorMeasureCmd[3] = {0xAC, 0x33, 0x00}; uint8_t eSensorMeasureCmd[3] = {0xAC, 0x33, 0x00};
uint8_t eSensorResetCmd = 0xBA; uint8_t eSensorResetCmd = 0xBA;
@ -52,7 +61,7 @@ bool AHT10Read(void)
Wire.beginTransmission(AHT10_ADDR); Wire.beginTransmission(AHT10_ADDR);
Wire.write(eSensorMeasureCmd, 3); Wire.write(eSensorMeasureCmd, 3);
Wire.endTransmission(); Wire.endTransmission();
delay(100); delay(80);
Wire.requestFrom(AHT10_ADDR, 6); Wire.requestFrom(AHT10_ADDR, 6);
for (uint32_t i = 0; Wire.available() > 0; i++) { for (uint32_t i = 0; Wire.available() > 0; i++) {
@ -80,12 +89,12 @@ bool AHT10Init(void)
{ {
Wire.begin(AHT10_ADDR); Wire.begin(AHT10_ADDR);
Wire.beginTransmission(AHT10_ADDR); Wire.beginTransmission(AHT10_ADDR);
Wire.write(eSensorCalibrateCmd, 3); Wire.write(eSensorCalibrateCmd, 3); // init with internal temp coef.
Wire.endTransmission(); Wire.endTransmission();
delay(500); // ?!?! too long delay(40); // after tests, its ok
return (0x08 == (AHT10ReadStatus() & 0x68)); return (0x08 == (AHT10ReadStatus() & 0x68));
} }
uint8_t AHT10ReadStatus(void) uint8_t AHT10ReadStatus(void)