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Wow - I can't believe I left that out - Compiler is MikroC. I am going to look into the analog configuration now.
[edit] I just hooked it all up to an oscilliscope and learned that the 3550 is not giving me anything on the SDO port. I am welcome to suggestions but will post up if I figure out...
I have been trying to get SPI up between my PIC24 and a MCP3550 ADC. I have tried several different things but i can't figure out why I continually get a zero written in all three of the iWord registers. I have Chip Select at RB2, SDI at RB3, and SCK at RB4. Any suggestions?
Datasheet for ADC...
I did some more research and decided to go with a RTD. I ordered a cheap sensor that I can use for testing. I am going to order a 22 bit serial ADC since the resistance varies so little.
The range I am most concerned with varies only from 127 to 133 ohm.
The ADC is the MCP3551. I am using app...
Of those options I am still thinking the TMP37 makes the most sense for my scenario. If you look at the error chart on the datasheet it has, at max, .2 degrees C error. Since I can calibrate it to .01 degrees C, it should be plenty for my application. I may build more of these circuits in the...
I have looked at temperature IC's like the TMP35 but the datasheet claims +/- 1 degree C. But apparently that is without calibration. The accuracy graph looks very promising.
If I were to use one of the IC's listed, I would go with the TMP37. It has the largest voltage swing over the...
I will be using a thermistor to measure temperature with a microcontroller. I plan to use the controllers 10 bit ADC. I want to display the temperature to tenths of degrees so I need the resolution to be as high as possible.
The chip will be powered by 5 volts. Without any other circuitry, by...
I actually read some data on how to interface with a SD card from scratch. It mentioned the voltage requirements for the card. That makes a lot more sense now that you mention it. But I didn't think about how I would drop the voltage for the data lines.
How would you recommend I accomplish...
Thanks. That's the starting point I need. I never claimed to be a software engineer but I am able to do a lot with a little guidance. I saw a picture of the interface we are referring to and saw surface mounted components and assumed they actually did something. I also looked again at this...
I am interested in designing a circuit that interfaces directly with a SD card. Are you telling me that all the 40 dollar interface board with circuitry on it is a direct link from the PIC controller to the SD card? There is no other circuitry that I will need when connecting a SD card directly...
"I would like to interface directly to an SD card without needing the module that microchip sells. "
I included this in the original post. This document entails the use of the PICtail™ Daughter Board for SD and MMC, Microchip product number AC164122
I am noticing that that link requires the use of a PC and hyperterminal. My hopes were to create a PIC ckt that would write to the SD card in a CSV format without any other PC.
Is there documentation for this?
I have PIC experience but I am new to interfacing with external storage. I want to create a CSV file onto either a SD card or a USB mass storage device.
I would like to interface directly to an SD card without needing the module that microchip sells.
Does anyone have any resources or...
Re: DAC output voltages
On the second DAC I linked, the rail to rail, how close should it come to outputting the Vref, 5V? Assuming it is powered by a filtered 12-14V source?
Re: DAC output voltages
The accuracy isn't as much of a concern as being able to output 4.5V when I only have a power supply of 5V running to the ucontroller and DAC. 8 bits is more than enough accuracy for that I'm doing.
So using the same voltage for Vdd and Vref is a bad idea?
Added after...
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