Search found 6 matches

by MarkB
Thu Nov 16, 2017 2:39 pm
Forum: General discussion
Topic: sinusoidal oscillations - average period
Replies: 3
Views: 103

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: 373

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: 86
Views: 5431

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: 11
Views: 654

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: 300

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,...
by MarkB
Mon Jul 17, 2017 5:47 pm
Forum: STM8
Topic: STM8 Core
Replies: 39
Views: 2275

Re: STM8 Core

I've been playing with STM8 a bit over the past year and thought I might add a few observations. 1) I wouldn't call STM8 "obsolete" as it's one of the newest 8-bit microcontroller families on the market. It also seems to be very widely used. 2) Peripheral set is very similar to the STM32 line. This ...