This is an exploratory question really (I am new to arduino / programing ) but I am curious as to weather an arduino board could be programmed with C++ to automatically control the rate of flow of the pump or fan speed ect. to dynamically control and hopefully improve cooling. In addition to this could the Arduino board support a small LCD screen so that real time temperature readouts could be given (I plan to have numerous temperature sensors placed on components?
Thanks.
Yes this does seem feasible. The challenge here might be the temperature measurement. Many of the cheap temperature/humidity sensors that are used with the arduino are actually very slow to register changes in temperature. You may want to do some research on this. Luckily you can do some experiments with temperature measurement and an arduino pretty simply, taking the output of the temperature measurement on the arduino IDE serial console.
The LCD, pump and the fan control is a are pretty widespread and it should be easy to find documentation on those.
Related
I am making a system for measuring whether or not there is vacuum present in big steel containers. They are located up to 100 meters from the control cabinet.
The question is, how many SPI sensors can I successfully use at the same time with an Arduino Mega?
I have two main concerns, and there are probably more things I didn't think about.
Signal strength
The shared lines for CLK, MOSI and MISO will need to be split up at several junction boxes and led to the different sensors. Since the voltage out from the Arduino is fixed, I'm fearing instability because the signal is weaker for some sensors, has someone done something similar? What is the greatest acceptable voltage loss for these lines to an ordinary sensor?
Processing
Will the SPI library be fine coping with this many sensors?
The refresh rate can be set to extremely low, thinking 0.3Hz.
The alternative to all this is to go for 4-20mA sensors and have a 0-5V converter circuit for each sensor, near the controller.
Any inputs would be greatly appreciated!
i have a little 2,4" tft touch display, and i want to display Information like Temperature of the CPU and the GPU, and the usage of the CPU cores. i tried getting the temperature with wmic and the MSAcip_ThermalZoneTemperature. but my system does not support that. Could someone tell me a way to get the Temperature and the other information without buying any extra hardware? My Mainboard: Asus M5A78L/USB3 (https://www.asus.com/Motherboards/M5A78LUSB3/)
Thanks, and have a great day!
Without extra hardware, the best way I can think of is to write a program for your computer that is able to pick up temperature statistics from your mainboard, then have that speak to your Arduino via Serial over USB.
The other option I can think of would involve finding out where the temperature probes on your mainboard live and physically tapping into those and reverse engineering how they work. However, this stands a very high chance of voiding warranties and ruining your board.
When I search online for EMG sensors, I often see these sensors are just made of a few transistors, resistors and sometimes diodes. Also I once read on a site that EMG sensors are some kind of modified voltmeters. But while I managed to make a voltmeter from an Arduino, I haven't been able to make an EMG sensor from an Arduino.
Does someone know whether it is possible to make an EMG sensor from an Arduino and how they did achieve this?
I think the biggest problem here is that of dynamic range. EMG signals are AC voltages typically in the low mV range and would need a gain of 100 or so to get them up to +/-2.5V, then a simple offset circuit to convert that to 0-5V for the Arduino analog inputs. However, that's not the whole story, since the small EMG signals can ride up and down on large low-frequency background voltages. Your AC amplifier would need a high-pass filter to remove those, or they could drive it off-scale which would prevent the EMG from getting through. If you reduce the gain to keep things in range, the EMG will be a rather small part of the 10-bit ADC range on the Arduino.
So the thing to ask is what is the point of using the Arduino in the first place? If you are going to connect it to a computer in order to look at the EMG signals, then why not just skip the Arduino and use the computer's sound card? The Mic input probably has enough gain already, and you get at least 16-bit resolution to handle any large non-EMG background that wasn't filtered out.
IMPORTANT! EMG measurements require direct electrical connection to the body. For safety, you should make certain that your recording equipment is electrically isolated. If you use only a standalone Arduino, you should power it from batteries. If you use a computer, it should be a laptop running on batteries, with no other connections to ground.
I often see these sensors are just made of a few transistors,
resistors and sometimes diodes.
That's true for pretty much all electronics devices...
Does someone know whether it is possible to make an EMG sensor from an
Arduino and how they did achieve this?
You cannot build an EMG sensor from an Arduino. But you read sensor values with an Arduino either through serial interfaces or by measuring voltages.
With a bare Arduino you can neither measure negative voltages nor can you amplify small signals. (we're in the µV range here...)
Just buy something ready or learn more on electronics
I am using 6 different sensors which are working simultaneously, but I got a problem in the readings from LM35 temperature sensor and MQ-7 Carbon Monoxide sensor. The values are changing depending on the power source.
How can I fix this problem? I'm planning to use a Sony power bank to feed my system but I am getting the wrong values especially from the temperature sensor.
Make sure that your power source is stable and continuous (i.e. make sure that your power bank is working fine and check its current output if its compatible with Arduino)
Make sure that your sensors are wired correct and working fine, try with different LM35 and MQ-7 sensors, if you have that chance.
Make sure that you are supplying your circuit with correct voltage and current, sensors may work unstable if you are supplying them directly from Arduino pins (because maximum current limit of the pins onboard may not be enough for your circuit), try an external power source such as MB102 power module.
Although, it's not a coding problem my suggestion is you can use signal conditioning to solved this. Search about low pass filter and high pass filter to filtering frequency in output sensor.
The simple method is using voltage divider, like this:
Vout = (R1/R1+R2) * Vin
R1 is your sensor, and R2 is resistor.
I'm somewhat stuck with a prob: I have a measuring-transducer Profibus-DP Master-device here that reads probe-values (eg. temperature) and I need to get those values into a Pi or Arduino. The Device is able to do Profibus-DP, PA and Hart.
I am right that there is no finished library and hardware for that? I've found industrial grade ICs like this and opensource stuff that quickly got lawsuited and a shield for RS-485. But even that shield wouldn't help me to actually communicate, right? I still would need to figure out all the protocoll-basics, timing and stuff?