Search found 6 matches

by fredbox
Fri Nov 22, 2019 1:22 am
Forum: Off topic
Topic: Old magazines
Replies: 2
Views: 373

Old magazines

I once had bookcases filled with of copies of Popular Electronics, Radio Electronics and others from the 1960s through the 1980s. I stumbled across a site that has these available as PDF - https://www.americanradiohistory.com/ . Scroll down about a third of the way down the page to the Technical sec...
by fredbox
Sun Nov 17, 2019 4:29 pm
Forum: Let us know a bit about you and your projects
Topic: Problem accessing the site from Firefox
Replies: 4
Views: 485

Re: Problem accessing the site from Firefox

I monitor the forum with an RSS reader. Prior to the change, I couldn't click on a link in a post without getting the warning but there was nowhere to click. Now I get the accept button at the top which is much better.
by fredbox
Sun Sep 29, 2019 11:09 pm
Forum: General discussion
Topic: [Roger's core] [Blue Pill] How to change PWM frequency ? [SOLVED]
Replies: 5
Views: 920

Re: [Roger's core] [Blue Pill] How to change PWM frequency ?

Here is a snippet of code I used to get a 60khz signal on Roger's core. // set timer 3 to 60KHZ square wave on PWMOUT pin (PA6 - T3C1 pin) HardwareTimer pwmtimer(3); #define PWMOUT PA6 setup() { pinMode(PWMOUT, PWM); pwmtimer.pause(); pwmtimer.setPrescaleFactor(1); pwmtimer.setOverflow(1200 - 1); //...
by fredbox
Sat Sep 14, 2019 6:12 pm
Forum: Off topic
Topic: current sensing, current measurement
Replies: 8
Views: 1524

Re: current sensing, current measurement

A MAX471 may do what you want - see http://henrysbench.capnfatz.com/henrys- ... surements/. These are readily available from the usual places.
by fredbox
Tue Sep 03, 2019 3:54 pm
Forum: General discussion
Topic: blue pill reached a $1.50 price point
Replies: 10
Views: 1491

Re: blue pill reached a $1.50 price point

If you live in the USA and have an Amazon Prime account, there are blue pills available on Amazon at 5 pieces for $15. It's not as cheap as AliExpress, but if I ordered today I would have them tomorrow. https://www.amazon.com/dp/B07B93MVJD/
by fredbox
Wed Aug 07, 2019 11:31 pm
Forum: Libraries & Hardware
Topic: LCD I2C not working with STM32F103 and Arduino IDE
Replies: 9
Views: 1342

Re: LCD I2C not working with STM32F103 and Arduino IDE

Also be aware there are at least three different versions of the I2C lcd adapter. See http://arduinoinfo.mywikis.net/wiki/LCD ... _Interface for more info. The ones I bought were version 3.