![]() The next plan is to add the WIFI board and send live data to Thinkspeak online this will still allow excel to gather data as well.Īll in all this is looking like a very cost effective project which can be easily added to with a small screen temperature sensors etc. This also automatically gets plotted into a graph there as well. I set up Excel to auto read from the file every minute and import the data. It then places it into a text file with a date/time stamp. I have found how to load data into Excel by doing the following,Ī free programe called Coolterm reads the data from the USB serial port. If this didnt test the temperature nothing would. The Aurdrino board is located beside a kitchen window which is opened and closed on a regular basis due to a cat! Its also beside a kettle. Could I drill a hole into the pier and bury it there ? The pier year in year out has quite a similar temperature. I have a pier which at the base is 1m x 1m and quite high. I have som contacts in Germany and so I can let it send to them and from there to Mexico.įGM 3 costs 32 Euro and shipping to Mexico would cost 55 Euro I'm trying out this microcontroller which can measure the frequency using a digital input. Stu (Carbon60) has a design that works extremely well and has a great writeup on the build using a bat detector to measure the frequency. ![]() The reading circuit also needs to be temperature controlled as well wherever it is indoors. The sensor FGM3 and voltage regulator board are best buried around a meter underground to keep a stable temperature. They are very sensitive and react to temperature fluctuations and voltage fluctuations as well. Hi Rainer the FGM 3 outputs a 5 Volt square wave and the frequency correlates with the magnetic field both higher and lower. So you do not read an analog Signal but a frequency and if I understand it correctly the higher the frequency is, the stronger the magnetic field ? this board can measure the frequency of a pwm signal from a sensor ie the FGM 3 with a program literally a few lines long called "freqcount". Looking at software to eliminate spikes and vehicles. I still have the cooler box and temperature controller setup to use as well. As the sensor is still underground and regulated power I can isolate temperature issues at the processor.įirst is to regulate power to the board and start getting some data to look at and see what problems there are. So while down I can play with the fgm3 and the boards. Yes Stu I use your design but had to disconnect due to room being redecorated etc. You'll need to address these in order to clean up the output charts. The other issue is the effect of sporadic 'noise' odd glitches caused by everyday objects or stray electromagnetic signals which I filter out of the data to eliminate spurious spikes. I've had to go to significant lengths to protect the integrity of the signal data using close temperature control at both the sensor and the receiver. Temperature fluctuations are the main issue I've found with my magnetometer. Looking forward to seeing more from this little (and cheap) device. Very early stage of this but if it works it's tiny, excellent price range and data can be seen from anywhere.Ĭool. ![]() This RTC board has a built in temperature monitor which compensates for temp effects on the quartz crystal and again is the size of a stamp! If this is a problem I think it can be solved by adding a very accurate real time clock board to it. The main thing I need to test is temperature and timing on the board and it's effects. The plan is to put this together and see how it performs. The signal can the be sent to a site called Thingspeak which then puts the data in graph form and can be easily accessible by mobile phone app or any device really. Loads of other boards can be added to the R3 like an ESP8266 which is a WiFi Board which again are only a few pounds. this board can measure the frequency of a pwm signal from a sensor ie the FGM 3 with a program literally a few lines long called "freqcount". I have purchased an Ardruino Uno R3 which can be bought for as little as £6.00. One project was a weather station which updates to the internet every 5 mins, measuring pressure, temp and humidity and all can fit into a matchbox! ![]() They literally can control or monitor anything. Hi I have been playing with Ardruino boards over the last few months.
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