Search found 210 matches

by danlee58
Sat Dec 24, 2016 2:59 am
Forum: Power Issues
Topic: Schottky Diode D1
Replies: 7
Views: 7169

Re: Schottky Diode D1

I would really like to get a 0.1"x0.1" perf board with the 6, 6, 8, & 6 Arduino pins. The 0.1x0.1 area should be connected in a matrix, and lands should connect to the Arduino pins.

I could eliminate this mating board with a redesign of the 3rd board in the stack.
by danlee58
Sat Dec 24, 2016 2:28 am
Forum: Power Issues
Topic: Schottky Diode D1
Replies: 7
Views: 7169

Re: Schottky Diode D1

I mis-mated the the Arduino J1 power pins. I probably connected +5V to ground. The 7805 survived, but D1 is gone. I'll just jumper it out. I have a board that plugs into the Super Pro, but it's a 0.1x0.1 perf board, and the mating is not perfect with the Arduino. I have to live with that until I get...
by danlee58
Thu Dec 22, 2016 7:50 pm
Forum: Power Issues
Topic: Schottky Diode D1
Replies: 7
Views: 7169

Schottky Diode D1

What is the function of Schottky Diode D1 (MBR0520) on the Super Pro board. The diode on my board seems to be open, and I can no longer power my board through J4. Can I simply jumper around that diode, my source is regulated 7.0 Volts?
by danlee58
Sat Sep 10, 2016 10:33 am
Forum: Projects
Topic: Digital Bandpass Filter
Replies: 5
Views: 5393

Re: Digital Bandpass Filter

I have code written in 'C' for a Coridium Super Pro. I think that processor is overkill for this application. How much do I need to change in my setup to use a Pro Plus?
by danlee58
Thu Sep 08, 2016 2:46 pm
Forum: Projects
Topic: Digital Bandpass Filter
Replies: 5
Views: 5393

Re: Digital Bandpass Filter

The signal that I want to sample is about 27 mVolts. I think that 12 bits should give me enough resolution.
by danlee58
Thu Sep 08, 2016 1:08 am
Forum: Projects
Topic: Digital Bandpass Filter
Replies: 5
Views: 5393

Re: Digital Bandpass Filter

A 12 Bit A/D should be OK. The A/D Sample Rate needs to be 20kHz. The Coridium ProPlus should be OK. I have a Digital Filter Design Program from Iowa Hills Software. I have already generated 32 Coefficients for a 5.6kHz FIR Bandpass Filter. I only need code to sample the A/D, and fill a 32 word arra...
by danlee58
Wed Sep 07, 2016 12:56 am
Forum: Projects
Topic: Digital Bandpass Filter
Replies: 5
Views: 5393

Digital Bandpass Filter

I need a digital bandpass filter. There is a single channel input signal of ~5.6kHz embedded in noise. I want to filter the noise & amplify the signal. When the signal amplitude exceeds a threshold, I'll set an output bit. I need a good A/D converter & reasonable sampling rate to prevent aliasing. M...
by danlee58
Wed Dec 30, 2015 12:03 pm
Forum: Other Hardware interfaces
Topic: Remote Programming I/F
Replies: 4
Views: 6500

Re: Remote Programming I/F

I intend to use this device as a direct plug-in to my Coridium based controller. I could also use a DB9 straight cable, or by swapping TX & RX pins, I could use a Null Modem Cable, since I kept the RS232 pinout for TX, & RX.
by danlee58
Sun Dec 27, 2015 12:51 pm
Forum: Other Hardware interfaces
Topic: Remote Programming I/F
Replies: 4
Views: 6500

Re: Remote Programming I/F

I built it, and it works. I included a toggle switch to short the Load pin on the Super Pro board to ground. I might need to open that connection to reset the board, or for any PRINTF statements in the code. Here is the pinout that I used on the DB9 connectors. 1 - 5 Volts 2 - RXD 3 - TXD 4 - DTR 5 ...
by danlee58
Thu Dec 24, 2015 7:47 pm
Forum: Other Hardware interfaces
Topic: Remote Programming I/F
Replies: 4
Views: 6500

Re: Remote Programming I/F

I have decided to use mating DB9 connectors. I won't need a cable. I'll plug the programming box into the host. I can also eliminate the toggle switch, if I just ground the Boot pin in the programmer.