Search found 11 matches

by MarkB
Sun Feb 04, 2018 3:58 pm
Forum: General discussion
Topic: How many fps can I expect if I use a 128x64 display and a blue pill?
Replies: 21
Views: 371

Re: How many fps can I expect if I use a 128x64 display and a blue pill?

Do you think it's a good idea? Just my opinion, but a numeric display of RPM on a racing bike is worse than useless. It takes too long to interpret and extra time spent thinking about some such at 200 km/hr takes away from far more important tasks. One needs to know more or less where they are rela...
by MarkB
Mon Jan 15, 2018 3:04 pm
Forum: General discussion
Topic: ESP8266 on Blue Pill
Replies: 6
Views: 299

Re: ESP8266 on Blue Pill

I see some examples using esp8266 from your link , so my question sir is how can I send a sensor reading from the "bluepill" pass it to a webserve via wifi module? Sorry for this noobee question but I`m confused right now. It's important to understand that there are several different approaches to ...
by MarkB
Fri Jan 05, 2018 5:11 pm
Forum: STM8
Topic: Introducing Sduino for the STM8
Replies: 26
Views: 2432

Re: Introducing Sduino for the STM8

Just curious as I used to get some kicks from the ATtiny85... (cheap, used to buy 'em in 25x qty.) I get the $1 each approx. board price, but can you share your use cases for the STM8? Minor point, but for cost comparison the STM8s103f3p6 minimum development boards can be found on AliExpress for ar...
by MarkB
Mon Dec 25, 2017 2:05 pm
Forum: STM32F103 Boards
Topic: Boot loader on "blue pill" questions
Replies: 4
Views: 424

Re: Boot loader on "blue pill" questions

Uploading via USB with the boot loader may or may not work without re-soldering a resistor. It will most probably work, I have never re-soldered any resistor on any of my 20 blue pill boards, and all work fine with the default values. Whether it works or not is a function of the host PC, so if one ...
by MarkB
Wed Dec 06, 2017 1:47 pm
Forum: General discussion
Topic: Trying to make STM32F103 and HC-05 work together
Replies: 18
Views: 403

Re: Trying to make STM32F103 and HC-05 work together

What's going on in the rest of your code? One possibility that comes to mind is that interrupts are being disabled (or a long (relative to the serial character rate) period of time spent in an interrupt service routine) in some other section of the code for a long enough period to cause Serial to mi...
by MarkB
Thu Nov 16, 2017 2:39 pm
Forum: General discussion
Topic: sinusoidal oscillations - average period
Replies: 3
Views: 167

Re: sinusoidal oscillations - average period

If it's a zero centered sine wave, looking for zero crossings is better than looking for peaks because the slope is at its maximum there, hence less measurement uncertainty. If it's not zero centered then take the mean of the waveform, subtract that, and it's approximately zero centered. If the sign...
by MarkB
Tue Nov 14, 2017 2:36 pm
Forum: Off topic
Topic: Uncle Andrew.. how come we have a $2 multi MHz board?...
Replies: 23
Views: 652

Re: Uncle Andrew.. how come we have a $2 multi MHz board?...

If the Android phone can be rooted (this is becoming more difficult) the "Linux Deploy" app will give one a chroot Linux install. I used one phone as a micro file server as one might use a RaspberryPi, except mine had a built in UPS and an integral user interface via an Android VNC client. It also s...
by MarkB
Tue Nov 14, 2017 12:50 pm
Forum: Postbag
Topic: Rogers postbag
Replies: 94
Views: 7097

Re: Rogers postbag

The voltage at the maximum power point of a solar cell is proportional with light intensity, but not so strongly that the panel is going to be delivering useful power at very low voltages. For load working voltages in the LiPo range (<=4.2 V) from a nominal 6 V solar panel, I don't think a step up c...
by MarkB
Mon Oct 23, 2017 4:41 pm
Forum: STM8
Topic: Introducing Sduino for the STM8
Replies: 26
Views: 2432

Re: Introducing Sduino for the STM8

any one figured out more than the above? which seem to suggest debug for stm8s is probably hitting a wall with open sourced tools. Having fallen deep down the eForth rabbit hole, I haven't got around to trying it out, but there is an STM8 into GDB project here since earlier this year: https://sourc...
by MarkB
Fri Oct 13, 2017 7:20 pm
Forum: General discussion
Topic: Power LED questions
Replies: 10
Views: 427

Re: Power LED questions

How about my thought about just taking flush cutters and cutting the LED in half? That shouldn't lead to any problems? (I've done it in the past with a Digispark LED, but some time later the Digispark blew. Presumably unrelated.) This would put a large mechanical load on the printed circuit traces,...