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Search: Posts Made By: EasyGoing1
Forum: General Electronics Technical Discussion 07-31-2022, 09:05 AM
Replies: 14
Views: 161
Posted By EasyGoing1
Re: How to flip a binary bit?

So as I was hooking up this bit flipper, it occurred to me that since I am using two separate stepper drivers, I could have just mirrored the dir pin from the main driver then flipped the coils in...
Forum: General Electronics Technical Discussion 07-31-2022, 05:13 AM
Replies: 14
Views: 161
Posted By EasyGoing1
Re: How to flip a binary bit?

Didn't even think about that ... but the DRV8825 definitely has current monitoring. I doubt the L298N has any current monitoring ... that thing is the closest you can get to Ape status in a stepper...
Forum: General Electronics Technical Discussion 07-31-2022, 04:12 AM
Replies: 14
Views: 161
Posted By EasyGoing1
Re: How to flip a binary bit?

Didn't realize it would actually work with R values this high ... very nice ... and VERY safe!

https://i.imgur.com/T9rvwPu.png
Forum: General Electronics Technical Discussion 07-31-2022, 04:08 AM
Replies: 14
Views: 161
Posted By EasyGoing1
Re: How to flip a binary bit?

I was originally going to just wire both steppers to the same driver but reverse the coils ... then all those discussions that we had here about ... flyback diodes, reverse current from motors ......
Forum: General Electronics Technical Discussion 07-31-2022, 03:33 AM
Replies: 14
Views: 161
Posted By EasyGoing1
Re: How to flip a binary bit?

Actually, I think this will work

https://i.imgur.com/80aUJsv.png
Forum: General Electronics Technical Discussion 07-31-2022, 03:17 AM
Replies: 14
Views: 161
Posted By EasyGoing1
Re: How to flip a binary bit?

I want two stepper motors doing the exact same thing, but in a mirror. And I wanted to see if I could step two DRV8825s using a single instance of the StepperMotor library. The only pin that would...
Forum: General Electronics Technical Discussion 07-30-2022, 09:49 PM
Replies: 14
Views: 161
Posted By EasyGoing1
How to flip a binary bit?

I want to drive two pins from the same output. However, I need each of those pins to have the opposite of the other ...

If output is high, then pin1 should go high and pin2 - low
If output is...
Forum: General Electronics Technical Discussion 07-23-2022, 01:29 PM
Replies: 26
Views: 544
Posted By EasyGoing1
Re: PWM LED Driver DIY - looking for comments and criticism

Yeah, the arduino is connected just like in the 555 schematic I posted, only instead of an 8k resistor, I'm using a 200Ω resistor. And the MOSFET isn't getting hot at all ... it's not even getting...
Forum: General Electronics Technical Discussion 07-23-2022, 08:57 AM
Replies: 26
Views: 544
Posted By EasyGoing1
Re: PWM LED Driver DIY - looking for comments and criticism

Spoke too soon about the 22v power supplies ... Amazon has a couple of options within budget:

Option 1 (https://www.amazon.com/IRobot-Roomba-770-780-790/dp/B00B658ECY)

Option 2...
Forum: General Electronics Technical Discussion 07-23-2022, 08:54 AM
Replies: 26
Views: 544
Posted By EasyGoing1
Re: PWM LED Driver DIY - looking for comments and criticism

What do you mean "switching the ground pins" ?

You talking about moving the panel over to the Collector side of the MOSFET?
Forum: General Electronics Technical Discussion 07-23-2022, 08:37 AM
Replies: 26
Views: 544
Posted By EasyGoing1
Re: PWM LED Driver DIY - looking for comments and criticism

This is the code I used for the ATTiny test.


const int POT = 3;
const int OUT = 1;

#define READ analogRead(POT)

void adjust() {
auto value = (int) map(READ, 0, 1024, 0, 254);
Forum: General Electronics Technical Discussion 07-23-2022, 08:33 AM
Replies: 26
Views: 544
Posted By EasyGoing1
Re: PWM LED Driver DIY - looking for comments and criticism

Well, I found a MOSFET that has a Vgs of 2.5V, but even with that MOSFET, the max output I'm getting using a 19V power supply is just over 16 volts.

So I used the bench power supply and found the...
Forum: General Electronics Technical Discussion 07-23-2022, 06:55 AM
Replies: 26
Views: 544
Posted By EasyGoing1
Re: PWM LED Driver DIY - looking for comments and criticism

To test my theory on the PWM resolution, I tried the same setup but with a Teensy 4.0 microcontroller, which has a 10-bit ADC (vs the 8-bit on the Arduino) and it lets me set the PWM frequency, and...
Forum: General Electronics Technical Discussion 07-23-2022, 05:05 AM
Replies: 26
Views: 544
Posted By EasyGoing1
Re: PWM LED Driver DIY - looking for comments and criticism

So I set up a test using an Ardunio Nano, which is the same as the Attiny85 in all the specs that pertain to this use case.

What I like about the microcontroller setup, is that I can get a much...
Forum: General Electronics Technical Discussion 07-23-2022, 02:05 AM
Replies: 26
Views: 544
Posted By EasyGoing1
Re: PWM LED Driver DIY - looking for comments and criticism

I've got a few from a project I did last year where I ordered a quantity of them.
Forum: General Electronics Technical Discussion 07-23-2022, 02:01 AM
Replies: 26
Views: 544
Posted By EasyGoing1
Re: PWM LED Driver DIY - looking for comments and criticism

That's still an option, and I have a few attiny's in the bin.
Forum: General Electronics Technical Discussion 07-20-2022, 11:05 PM
Replies: 26
Views: 544
Posted By EasyGoing1
Re: PWM LED Driver DIY - looking for comments and criticism

SO lowered the gate resistor to 220 and tried an IRF540 Mosfet but no change in terms of the noise ... I did try an RC filter at the output and that made a huge difference ... at the cost of...
Forum: Troubleshooting & Designing Networks 07-16-2022, 07:12 PM
Replies: 1
Views: 149
Posted By EasyGoing1
UPNP, "Standards" and hardware that implements it

I've been writing a program in Java that is really just a robust front end for the use of GitHiub Gists, providing a nice interface for developers to organize, maintain and access code snippets that...
Forum: General Electronics Technical Discussion 07-16-2022, 06:35 PM
Replies: 9
Views: 814
Posted By EasyGoing1
Re: Here is a good USB C tester that actually works first time you connect it to a de

That's interesting ... My main disappointment with the charger, and I have not given it much time in terms of verifying what I think I'm seeing with it but when I use the charger to power an external...
Forum: General Electronics Technical Discussion 07-16-2022, 06:23 PM
Replies: 26
Views: 544
Posted By EasyGoing1
Re: PWM LED Driver DIY - looking for comments and criticism

Interesting thought on the off time for the TIP120 I'll try it with a mosfet and see if that changes anything. I think the 8k was the original point of output where you would just connect a single...
Forum: General Electronics Technical Discussion 07-16-2022, 06:07 PM
Replies: 26
Views: 544
Posted By EasyGoing1
Re: PWM LED Driver DIY - looking for comments and criticism

All I know is that the issue with it has gotten worse over time. Meaning that the amount of voltage "sweep" has gotten smaller and the distance from the turn on point to when it goes to max voltage...
Forum: General Electronics Technical Discussion 07-16-2022, 04:25 AM
Replies: 49
Views: 1,266
Posted By EasyGoing1
Re: BAUN - UVST - 0617,Can anybody Identify these Please?

Yeah, I have to say ... because she lives out there now I've had the opportunity to learn things about your country that just isn't generally discussed out here in the wild west ... and I've gained...
Forum: General Electronics Technical Discussion 07-16-2022, 04:20 AM
Replies: 26
Views: 544
Posted By EasyGoing1
PWM LED Driver DIY - looking for comments and criticism

So some of you might remember when I did this project

https://i.imgur.com/s6nBvdE.jpg

Which I then ended up using this dimming circuit (https://www.amazon.com/gp/product/B01AY6NUJW) to drive...
Forum: General Electronics Technical Discussion 07-16-2022, 04:02 AM
Replies: 9
Views: 814
Posted By EasyGoing1
Re: Here is a good USB C tester that actually works first time you connect it to a de

I've been curious about that very thing ... as I only recently got into these USB-C chargers and was surprised to know that they even negotiate voltage at all ... until you think about the fact that...
Forum: General Electronics Technical Discussion 07-16-2022, 03:37 AM
Replies: 16
Views: 675
Posted By EasyGoing1
Re: resistors in parallel ?

I struggle with these MAh ratings on these batteries ... so for example, a battery is rated at being capable of sustaining 3,000 MAh ... which says to me that it can continuously provide 3 amps for...
Showing results 1 to 25 of 500

 
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