![]() ![]() ![]() The resolution of the 8-bit timers would be 5V/256=20mV, so we opt for Timer1 to get 10-bit resolution. The characteristics are determined by the PWM frequency and the values of the resistor and capacitor. ![]() A capacitor is connected through a resistor to a PWM pin. With just one capacitor and resistor, timer1 can be used to create an analog voltage with a resolution of 5mV or better.Ī low-pass filter can ‘average’ the PWM signal to an analog voltage. Some modules take an analog voltage to regulate a parameter (display contrast, detection threshold etc). Even with tank level sensors you don't, you wouldn't even need a timer FWIW.The Arduino does not have a true analog output. If you don't want extras then you don't need Arduino. The tank reaches a high level and the pump runs till the level is low - like how thermostats work. With tank level sensing you might make it so the operator doesn't have to touch a switch for the pump to run. Life taught me different, "things happen". What can I say, I don't just plan for everything to always go right. the operator doesn't need to do anything but notice a blinking red light and realize something needs checking. With tank level sensing the pump won't run 10 minutes when there's 5 minutes of stuff to pump, including if a hole gets knocked through the tank and you don't see it drain. What you want to run off mains power cheaply, get a big enough relay. FETs are very efficient when full open or closed. So? Using a FET is like a using relay only easier and uses far less energy and the relay is more expensive and likely to wear out sooner. "The pump is a long way from the switch so I used the relay." It needs a heatsink (screw the tab to thick steel that doesn't get hot) and maxes out at 47 Amps if kept 25C/77F and down to 33 Amps at 110C/212F whether 5V, 12V or 50V. A Nano is cheaper and smaller, has the same chip in a smaller form and can do it.Ī power FET like IRLZ44N can switch that 12 pump ON and OFF with as little as 3V on the gate. I need to keep it simple.Īn Uno can do it. One of our older operators already has enough trouble with the technology in the cab and we are upgrading to a more complex planter. It cannot be something that has to be reset every day or time. I need to make something simple and reliable. From what I am reading I can do this with a UNO? Also looking at the other posts it looks like this already exists. It's just transferring liquid from a front tank to a bigger tank pulled on a planter. ![]() I want to be able to push a button or flip a switch and the pump runs for a set amount of time like 5 or 10 minutes. I believe the new pump will draw fewer amps. I was thinking about switching to a solenoid. The pump is a long way from the switch so I used the relay. I cannot find a chart telling about amp draw. I have installed a different pump that is 20 gpm. The pump I had only put out about 7 gpm, but pulled about 20 amps. My current set up has a switch in the cab that runs a relay. One small, cheap Arduino board can control dozens of things when done right.Įxcuse me if I don't use the correct terminology. If you have chickens, coop door automation is a project that comes by every year or two. Switching 12VDC ON/OFF, how many Amps does the pump draw? There's likely a power FET that can do it for less than $1. I'd have indicator led(s) near the controls too. I for one would have tank level sensors as well as time limiting the pump. You can save loads of time with good hard upfront planning. Before buying parts, get the design down tight. ![]()
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