VOLTAGE SENSOR (0-25V) - Arduino tutorial #17 

You're welcome! 😃

I have honestly no idea. It could be that the sensor is not using this pin. Sometimes they have 3 pins to match the standard sensor wires which have 3 connectors and these are not all used.

Thanks! :)

Can you please elaborate this procedure?

@@noccloud say you want to monitor a voltage about 26 volts and you have a zener diode at say 24v. I would put the zener diode at the positive side of the 26v in series with a 1K ohm connected to zero volts. The voltage across the resistor is 26-24 =2 volts. The Arduino can measure the 2 volts. The software can add the 24 volts to give an accurate reading of the 26 volts.

No this could be very dangerous! The max voltage is 25V Higher will damage the sensor or worse. You then should look for a sensor which suits the voltage range you want to measure.

@@BasonTech why not just put a zener diode in series. Say a 5 volt zener diode dropping a 28v battery down to 23 V to enable estimation of the battery voltage?

My pleasure! I am not sure if it can.

Great to hear! Thanks! 😃

You're welcome! 😃

I think this voltage divider calculator will help you with that ohmslawcalculator.com/voltage-divider-calculator 😃

With an Arduino for sure! Just monitor the input of the voltage sensor and trigger the relay when you please 😃

Glad I could help! 😃

I do not see why not, however I've never used this sensor so at your own risk 😄

On what part of the code do you het stuck?

@@BasonTech double adc_voltage1 = 0.0; double adc_voltage2 = 0.0; // Floats for resistor values in divider (in ohms) double R1 = 30000.0; double R2 = 7500.0; // Integer for ADC value int adc_value1 = 0; int adc_value2 = 0; void setup(){ // Setup Serial Monitor Serial.begin(9600); Serial.println("DC Voltage Test"); } void loop(){ // Read the Analog Input adc_value1 = analogRead(A0); adc_value2 = analogRead(A1); // Determine voltage at ADC input adc_voltage1 = (adc_value1 * 5.0 * 10.0) / 1024.0; adc_voltage2 = (adc_value2 * 5.0) / 1024.0; // Calculate voltage at divider input double in_voltage1 = adc_voltage1 / (R2/(R1+R2)); double in_voltage2 = adc_voltage2 / (R2/(R1+R2)); // Print results to Serial Monitor to 2 decimal places Serial.print("Input Voltage1 = "); Serial.println(in_voltage1, 4); Serial.print(" Input Voltage2 = "); Serial.println(in_voltage2, 4); // Short delay delay(500); }

i have done this but it is not working

what error do you get?

Good question! I guess it depends on the oscilloscope, but I doubt if it works with the same principle.

I have no experience wilt a PLC so can't give any recommendation, sorry.

You're welcome! 😃

That is hard to say, a guess is the sensor is broken. But that is just a wild guess.

I am sorry, I have no experience with a mosfet so I can't help you with this issue. My suggestion would to ask this on the Arduino forum forum.arduino.cc/ or on Reddit at the www.reddit.com/r/askelectronics/ subreddit. Hope this helps 😃

Sure, as long as the voltage of the device you are probing stays within the sensor range 😃

@@BasonTech of course, but is it a software or a hardware issue? Let's assume that we have one battery standby and when we notice a big drop of the main, to change using a relay to the reserve. How could this, be done. Thanks in advance

Just measure the voltage till it drops below a certain threshold, then switch the relay.

I do not really have any experience with this sensor and the ESP32. I guess you can do the same measurements as I did for the Arduino. Only the ESP has 3.3V instead of the 5V Uno.

From what I understood it is a mounting hole. If is said the metal helps to keep PCB layers together if there are multiple.

You mean for the code?

I guess you'll need a more accurate sensor if you wish such an accuracy.

Alternatively you can take 20 measurements in a second and calculate the average as a good estimate.

Good question! To be honest I don't know. Maybe you can find it with the datasheet of this sensor?

@@BasonTech i found that it's not possible, because that would exceed the 5v per pin on the Arduino. you would need to design a circuit with specific resistors to be 0-0.5 V per pin adjust scaling factor, and now 10s of 0.5v modules is 5v and now the Arduino wont be fried, probably.

I never did, but I guess you can since the RPI has GPIO ports 😃

Hi, have you connected your Arduino to the sensor the same way as shown on the circuit schema in the course material? arduino-tutorials.net/tutorial/reading-voltage-sensor-with-arduino

@@BasonTech I have wired it up the same and i get no power from the same pin, so where does the power come for the arduino?

@@BlondieSL hi there Yes I worked it out thank you. I pretty much did the same as you have said and all works good.

The + pin is not connected to anything... Forget it exists.

I don't think this sensor has such high resolution. The way this sensor works is just an estimate of the voltage.

Just connect your wire straight onto an analog pin.

Hard to say, could it be that there is some loose connection? Otherwise this sensor might not be the best for your project.

As far as I'm aware this one is just for DC

Hi Danial, I am not entirely understand your question. What do you want to achieve?

Just multiply what Arduino reads off the S Pin by 5 = your measured voltage.

@@sapoty If we use this with an esp8266 or esp32 (which both use 3.3V), would we multiply by 3.3 instead of 5? Or do we still multiply by 5?

I think 1A is a bit too much for this sensor. But I can't proof it with a datasheet. All specs I could find talk about the voltage range and not the current limits.

@@BasonTech then 175mA ?

I assume it should work. Unfortunately without a datasheet telling me so, I can't confirm anything 100%. Use at your own risk 😉

@@BasonTech thank you 👍

Is it perhaps an AC power supply? How much is it fluctuating?

You're welcome! 😃

@@BasonTech When volt increase or decrease factor will change

You'll find a link to the code in the description of each video 😃

Thanks for sharing!

Hi, as long als you stay within the boundaries of the sensor there shouldn't be a problem doing so.

@@BasonTech what is the model of the module you used. Thank you.

arduino-tutorials.net/r/8xim06

I don't want to call this a scam. It just suits another target audience. There are many Arduino kits which use a 3 wires glued together for sensors, buttons etc. Therefore every PCB sensor has 3 pins even though they are not all connected. You can easily make this yourself with bare components as shown in the video. Some prefer not to and want to use an off the shelf component. The purpose of this tutorial is not to show the best / preferred way of measuring voltage. It is to show you to use and connect this specific voltage sensor.