We are doing a research and there is only one week left before the mock defense. I just want to ask something because we are doing a temperature based fan speed.
I want to ask if it is possible if a normal stand fan with 230v is possible for this project? We are trying to search the internet for it and the only fan that we see is 12v DC fans that is used for computers. However, I found an AC light bulb that is 230v is used in one project. So is it possible to use a 230v stand fan?
The materials we bought are:
Arduino Uno R3
LM35 DZ temperature sensor
LCD
Single channel relay module 5v
Jumper wires
Breadboard
We are still short on materials since we still haven't bought the resistors and whatnot. Right now I just need suggestions.
Hi @imdoctor welcome to the community
Here are few suggestions
Safety precautions
Power supply: Make sure that the power supply for the fan is sufficient with the fan's voltage rating (230V in your Case ).
MOSFET you may need to use a MOSFET as a switching element to control the fan's power. The relay module may have a built-in transistor or MOSFET, but you have to check over it.
5. Optocoupler (This is optional) : Consider using an optocoupler between the Arduino and the relay module. This can provide electrical isolation between the low-voltage Arduino circuit and the high-voltage fan circuit, enhancing safety.
Remember to look into fan datasheet or manual to understand its electrical requirements and make sure your circuit design is appropriate for the fan's specifications.
Yes, ensure your mains circuit breaker is, indeed, closed. (?t?f?)
@imdoctor - Look up "ESC (electronic speed control)" to control an A/C motor... this link describes how with a 12vdc fan (not mains a/c) in mathematical detail. Safety first! : )
We are considering using a 12v dc fan. However, we have encountered a problem regarding the PWM. The PWM is responsible for controlling the speed of the fan right. So do we need to find a fan that is PWM compatible? Isn't that a little to hard or nah? Or can we just use a normal fan and stick to it?
Can I ask if a normal 230v AC electric fan or 12v DC electric fan is viable? We have encountered a problem involving the PWM since it is the one responsible for the control of the speed of the fan depending on the temperature. So is it ok to use a normal electric fan(such as the 230v AC or 12v DC)? Or should we use a PWM fan? Or can we use a normal electric fan with PWM? I am so lost right now I don't how we can do this.
I have a question. We are considering using 12v electric fan instead of 230v electric fan. However, we need to use PWM in order to control the speed of the electric fan according to the temperature of the surroundings. Can we achieve this by just using a normal electric fan(12v DC or 230v AC)? Or we need PWM fans like the ones that is installed in computers? The problem in that though is that we really need to use a normal electric fan for this project. But all of the PWM fans that we see are used in computers such that they have 4 wires to indicate the that the extra wire is the PWM.
I made a design a long time ago for PWM 48 volt fans. The seller of the fans said: No. What the hack? Connect GND to the fan and shortly, fractions of a second, apply the positive. What happens? The fan makes a short rush!
I remember we used a very low PWM frequency. I don't remember if it was 25 Hz or 250 Hz. The goal was running at 25, 50, 75 or 100% speed. It worked like a charm.
A conventional DC motor fan is like any DC motor.
BLDC, as I think the 48 volt fan was, can also be PWM controlled as I think.
Do the simple testing I did! Hand connecting, short time! Use a rather low PWM frequency, not the 450 or 900 Hz that's standard in many Arduinos.
