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Controlling Position of Stepper for Roll Winding
I'm working on a solution for a paper roll winding application.  As the roll turns, which is powered by a stepper motor, the paper is pulled onto the roll.  As the roll...
Saturday, 6 February 2016 - 16:35
Contact Tachometer Wheel
I'm looking for a contact-type tachometer for a project where I need to measure the linear speed of a clear plastic film as it passes over a surface.  The film will be rolled...
Wednesday, 28 October 2015 - 21:12
Choosing a 2.4GHz Transceiver (802.15.4)
I've been swimming in the sea of 2.4GHz transceiver modules available (similar to an XBee), and it's been a bit daunting.  I was hoping to get input on a suitable solution...
Friday, 2 October 2015 - 19:10
NSC Pressure Transducer - Full Scale Output
I'm working on a circuit which uses a Honeywell NSC pressure sensor, uncompensated and unamplified.  Looking over the specs for this, I'm having a bit of difficulty...
Friday, 27 March 2015 - 21:49
Multiple Bit Manipulation within Single Macro
I'd like to simplify code that I'm working on by using bit manipulation macros similar to:   #define BIT_MACRO PORTD |= (1 << 5)However, I'd like to combine...
Friday, 20 March 2015 - 14:21
Switching Solenoid with P-Channel MOSFET
Hi All,   I'm having a bit of an issue with switching a +12Vdc solenoid off using a p-channel MOSFET (IRFR9220).  I've attached the circuit as it sits currently on the...
Thursday, 20 November 2014 - 20:46
RS232 Comm with USB to TTL
Hey all, I been working on a program which takes readings from an analog sensor and relays this information to the PC terminal (br@y's terminal to be exact). I was using a USB to...
Saturday, 3 May 2014 - 18:35
ATMega168 - RS-232 and USART
Hi All, I've run into an issue trying to connect the ATMega168 micro with a PC's RS-232 via USART. I've been attempting to follow tutorials on both this site and a few others. My...
Wednesday, 30 April 2014 - 00:52
Interfacing SD Card to ATMega
Hi All, I am trying to interface a ATMega168 running at 8MHz with an SD card using Chan's PetitFs software. I am using the PetitFs that has been converted to use SPI rather than...
Friday, 6 April 2012 - 18:05
Level Translation Circuit
Hey all, I am trying to level shift SPI bus communication from 5V to 3.3V. I am using a circuit similar to the solution shown in Phillips App Note AN97055, except that I am using...
Monday, 12 March 2012 - 02:12
1-Wire Bus Questions
Hey all, I have a question regarding the 1-Wire Bus. I am using WinAVR and trying to interface a ATMega168 (running at 8Mhz, CLKDIV/8 fuse is not set) with a DS1822 digital...
Wednesday, 21 December 2011 - 03:22
Implementing Chan's FATFs
Hey all, I am trying to put a (very) rough timeline together for a project. I am going to be writing data collected from various sensors into an SD card. Anyway, I ran up on...
Sunday, 13 November 2011 - 22:11

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