ArduinoGeneral

3.3 Volt comparability of analogue sensors

userHead Vlad 2016-02-16 01:23:12 3829 Views5 Replies
I have hooked up the Analog EC sensor to a 3.3 v micro controller, and it seems to be working. Your website says that it's a 5V item. Am I using it outside of spec?
What about other water sensors, so Analog pH Meter Pro, Analog ORP, etc? How do I know which ones are 3.3 V compatible?
2018-01-22 16:29:56 Do you mean the value you got are wrong? where do you put the sensor and what are the outputs? userHeadPic robert.chen
2018-01-22 10:40:54 Hi, can you elaborate more on why values would be wrong? Is there any way we could workaround this problem?
- Thanks
userHeadPic edgarlz123
2016-02-19 11:08:23 Hi Vlad,

You are wecome, it should be 5V :)
userHeadPic Leff
2016-02-17 21:31:55 Thanks!
I know it says 5V, but I didn't know if it's a recommendation or a requirement.
userHeadPic Vlad
2016-02-17 04:51:09
Leff wrote:Hi Vlad,

Welcome!

Although 3.3V would get it working, but the readings are not correct actually, as you could read on the wiki that Please use an external stable power supply(such as 7.5V DC),and the voltage of MCU system as close as possible to the +5.00V. More accurate the voltage, more higher the accuracy!

Other water sensors are also 5V compatible instead of 3.3V.


Do you mean the readings will be incorrect at all, or do I just need to calibrate the probe?
From what I see, all parts of the circuit can operate at 3 V
userHeadPic Vlad