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+--- Thread: EZO sensor not working (/showthread.php?tid=6064)
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EZO sensor not working - TeRRia - 07-13-2024
Hello,
KC868-E16P is a great product, I love it!
I am almost finished connecting all my sensors and devices using ESPHome.
Only remains 2 EZO sensors (1 device is pH, the other ORP). This is from Atlas Scientific: EZO™ pH Circuit | Atlas Scientific (atlas-scientific.com)
I found this code on EZO sensor circuits — ESPHome
- platform: ezo
id: ph_ezo
address: 99
unit_of_measurement: "pH"
update_interval: 10s
The device is connected to SDA / SCL.
Problem:
- Results from i2c bus scan doesn't detect the EZO sensor (I know the SDA / SCL ports are OK since I am able to detect an additional PCF8574 board for instance).
- While the device isn't detected, it is somehow interfering with ESP32 since I am seeing this in the logs:
[W] [component: 157]: Component pcf8574 set Warning flag: unspecified
[W] [component: 170]: Component pcf8574 cleared Warning flag
Questions:
- How to make my EZO sensor work please ?
- For my second EZO sensor, should I connect it to the IC2 extender ?
Thank you.
RE: EZO sensor not working - admin - 07-13-2024
if the sensor is i2c bus, you can connect with i2c extender. VCC,GND,SDA,SCL.
RE: EZO sensor not working - TeRRia - 07-13-2024
(07-13-2024, 01:40 PM)admin Wrote: if the sensor is i2c bus, you can connect with i2c extender. VCC,GND,SDA,SCL.
Thank you for your fast answer.
I cannot test i2c extender yet since I need to order the connector.
Could you clarify please:
i2c SDA on GPIO16 and i2c SCL on GPIO15 cannot be used right ?
RE: EZO sensor not working - admin - 07-14-2024
use this i2c pin define in ESPHome:
IIC SDA:GPIO16
IIC SCL:GPIO15
connect your sensor's 4 pins with i2c extender, just need confirm your sensor's i2c interface power voltage. suggest you take a photo of your sensor interface.
RE: EZO sensor not working - TeRRia - 07-14-2024
(07-14-2024, 12:38 AM)admin Wrote: use this i2c pin define in ESPHome:
IIC SDA:GPIO16
IIC SCL:GPIO15
connect your sensor's 4 pins with i2c extender, just need confirm your sensor's i2c interface power voltage. suggest you take a photo of your sensor interface.
Thanks but it didn't help I am afraid.
My 2 i2c sensors work between 3 to 5v DC so they should have been detected by i2c scan.
Neither are working properly (but I can see that they are under power - green light on).
If I swap them by a PCF8574, this one is detected in the logs and works well.
See attached photos & logs for more clarity.
RE: EZO sensor not working - admin - 07-14-2024
take a photo of your sensor every pin define, now can't see the label on pcb.
RE: EZO sensor not working - TeRRia - 07-14-2024
(07-14-2024, 12:35 PM)admin Wrote: take a photo of your sensor every pin define, now can't see the label on pcb.
There you are. I am connecting everything except the "OFF" PIN.
TX on SCL
RX on SDA
I also tried inverting them without luck.
As per this link: Electrically Isolated EZO™ Carrier Board | Atlas Scientific (atlas-scientific.com) both UART or i2C can be used.
RE: EZO sensor not working - TeRRia - 07-14-2024
There you are.
SCL = TX
SDA = RX
Also tried inverting them just in case.
As per Electrically Isolated EZO™ Carrier Board | Atlas Scientific (atlas-scientific.com) it should work with both UART and I2C.
RE: EZO sensor not working - admin - 07-15-2024
i see now. this is not a i2c sensor, just a serial port sensor. so you can't connect with i2c extender.
the sensor have private protocol, so you can't integrate to home assistant directly.
RE: EZO sensor not working - TeRRia - 07-15-2024
(07-15-2024, 12:44 AM)admin Wrote: i see now. this is not a i2c sensor, just a serial port sensor. so you can't connect with i2c extender.
the sensor have private protocol, so you can't integrate to home assistant directly.
Yes you can.
Please read this link:
EZO sensor circuits — ESPHome
This is an i2c sensor (or UART, as mentioned in previous message it works with both protocols).
So it's well integrated with Home Assistant and ESPHome.