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Hi all, i need some help is choosing the best pressure sensor for a project i'm doing. The sensor needs to monitor the pressure inside a sealed enclosure which will be vacuum sealed with the expected pressures to be in the range 50mbar to 150mbar. As far as i understand i need an absolute...
Oh thankyou, my apologies, I thought it was rail to rail. Can you suggest any common rail to rail op amps I could use? Is the 741 rail to rail? I was just using the symettric power supplies when testing but I realized the -vcc should be grounded.
Hi Alex, i built the differential amplifier circuit you suggested, using Rf as 15K and R1 as 10K, with a potential divider circuit providing the 2.5 V bias that goes to the non-inverting pin. It appears to be doing the voltage division, however the output never exceeds 3.7V, shouldn't the...
Hi all, this may be a simple question but please bare with as my background is more hardware than software. I'd like to know what's the quickest way or algorithm of inverting a binary number, such that the msb becomes the lsb and so on.
Regards
Hi there. i've been having trouble with using the ADC of my dsPIC30F4011. All i'm trying to do is read the voltage a from potential divider circuit, betwen 0 and 5V, on channel AN0 in fractional format and display the result on PORTB. However, i get no output for any input voltage. Heres my...
Hi easyrider, thanks for your input. Although would you mind explaining your method of two interrupts in more detail, and also why polling can't be used in interrupts, i wasn't aware of that. I also plan to implement two channels such that i read the ADC value on both channels at different...
Hi there, i'm in need of some expert advice. I need to perform sampling of an audio signal at a around 40 kHz on my dsPIC. The way i thought of achieving this is by setting up a timer interrupt at the set frequency and on every interrupt read the ADC and store the result. I plan on setting up...
Hi there, i'd like to know if the data bus pins on controller IC's for displays have to run of a single port of a microcontroller? I'm planning on using an OLED with a SSD1325 driver IC. In parallel operation mode it has 8 data pins that need to be written in order to perform certain commands...
Hi everybody, i'm in desperate need of some help. Has anyone managed to interface one of the dsPIC30F's, in particular a dsPIC30F4011, with a standard 16x2 character LCD?
I want to use the LCD sa a debugging tool in my project but haven't had success with anything i've tried thus far. I've...
Thanks, i really didn't think it was that simple. I do have a question though, just for clarity, when the signals on each of the two channels are combined do they then become super-imposed onto the one channel?
Also what is the role of the resistors, are they just there as current limiters?
Hi guys, this may seem like a fairly simple question compared to the other posts i've seen here but i still need some help nonetheless. What's a simple yet effective way of combining the left and right audio channels from a 3.5mm output input so that a single audio channel can be obtained to...
Hey easyrider please do get that chip name, I do want to look more into that option.
Thanks joey, that development board does seem perfect, the only issue is that its a university project so budget becomes a bit of a problem and they don't like us using development boards that much, we're...
Hi everybody, i'm in need of some expert advice. I'm planning an audio spectrometer project whereby i need to sample an audio signal, perform the fft algorithm and then display the results on some form of graphical display (I'm thinking along the lines of an OLED). The FFT i'm going to do is...
Thanks bunalmis, your solution seems fairly simple, but would you mind explaining to me whats actually happening in the circuit? Programming is more my thing than analog electronics.
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