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Measuring EC for hydroponics
I'm trying to get an idea of the OHMS of resistance to millisiemens.    From googeling  .001 millisiemens per centimeter = 1 EC   200 millisiemens = 5 OHMS...
Friday, 12 July 2019 - 14:50
Atmel ICE USB Sudio 6.2 Tool not showing up.
Hi, I have not been programming for a while and I bought a new Atmel-ICE and installed Studio 6.2 on Windows 7 My older USB AVR  JTAG ICE shows up and works. When I plug the...
Sunday, 25 September 2016 - 03:37
Corona Treating materials for printing
I own a screen printing shop, we also have a digital printing press that needs treated material for the ink to stick. The material we buy has what is called digiprime5000. It is a...
Monday, 29 October 2012 - 03:49
Question on Trickle Charge DS1302 and an ML2430 Lithium
I am designing some devices to track my machines capacity utilization data. I am using a tiny2313, a FM24C64 Fram memory chip and a DS1302. The battery I plan to use is a ML2430...
Saturday, 29 September 2012 - 06:33
What type of sensor for this task
We are using a coating machine that has two rollers. A small amount of UV ink rides between the rollers. I am using a peristaltic pump to add ink as the machine runs. What would...
Thursday, 27 September 2012 - 07:06
Brain exercise project, watts, temperature hotplate
A friend of mine bought one of those maker bot type CNC 3d plastic oozing machines. I guess they need a hot plate to make the parts on so that the plastic doesn't cool too fast...
Friday, 6 April 2012 - 03:12
Using an AVR to monitor LIPO minimum voltage
I am now using LIPO batteries for my LED designs. I have a 1 amp PTC fuse with a battery monitor (tiny13). My initial design used the BOD fuse set at 2.7VDC and I powered the Uc...
Saturday, 10 March 2012 - 14:44
Why only 2.3 mA what's the point? Opto-Interrupter
I bought a bunch of these Opto interruptors for my CNC machine. I looked at the initial rating of 20mA as the current this little guy could pull down. http://www.mpja.com/download...
Wednesday, 8 February 2012 - 01:04
Need some help with noise on Home and Limit switches for CNC
I have converted an old NC mill to full CNC by adding a quill drive. I am using gecko drivers and an 72VDC power supply. I am having a problem with the home and limit switch wires...
Friday, 3 February 2012 - 08:37
Chopper circuit for steppers
I have designed this chopper circuit. I used a bootstrap circuit using an avr PWM to boost the voltage for driving an NPN mosfet on the high side. I have on order the IRS2186...
Tuesday, 22 November 2011 - 21:59
Measuring ohms on a stepper motor
I just bought an old excello mill that has slo-syn stepper motors. rated at 1.3V 20 amps. Typically you can measure ohms on the coil to determine the center tap however measuring...
Wednesday, 9 November 2011 - 17:41
Hall Effect Sensor 2.2 - 2.8V Quiescent Current
I am using the A1301KUA-T IC Hall effect Sensor. It operates at 5V dc and outputs 2.2 - 2.8 VDC as a Quiescent current. I will be using the magnetic pole that drops that voltage...
Friday, 16 September 2011 - 00:48

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