Search found 1544 matches

by ahull
Wed Aug 16, 2017 9:14 pm
Forum: Libary request
Topic: MPU-6050 (I2C) Library
Replies: 34
Views: 5474

Re: MPU-6050 (I2C) Library

I'm not sure if anybody on the forum is the Joop Brokking who produced this video, but I'll leave this here just for completeness.

by ahull
Mon Aug 14, 2017 9:42 am
Forum: STM32F4 Boards
Topic: f407vet6 & f407zet6
Replies: 95
Views: 5083

Re: f407vet6 & f407zet6

zmemw16 wrote:
Sun Aug 13, 2017 12:25 pm
the zet is remaining rather high at about $15
zgt not seen
srp
At that price, you might be tempted to go for a Pi Zero W instead of the ZET
by ahull
Fri Aug 11, 2017 6:41 pm
Forum: Hardware
Topic: A look inside the DS3231 RTC
Replies: 9
Views: 178

Re: A look inside the DS3231 RTC

I spotted that. I have some of those modules on my raspis. Its actually quite an interesting device, and with a bit of tweaking is pretty accurate. I wonder how accurate you could make it with a bit of oven control and a GPS reference to tune it.
by ahull
Fri Aug 11, 2017 1:51 pm
Forum: Off topic
Topic: Short circuit generator
Replies: 22
Views: 268

Re: Short circuit generator

konczakp wrote:
Fri Aug 11, 2017 10:16 am
Ok so I've made a few calls and I will borrow today 200HHz scope. Write me then please what to measure an when ?
You will need to take a few pictures of the waveforms, so we can see what is what.
by ahull
Fri Aug 11, 2017 9:06 am
Forum: Off topic
Topic: Short circuit generator
Replies: 22
Views: 268

Re: Short circuit generator

I think a bit of reverse engineering may be in order. Maybe its time to take the cover off one of the slaves, and take some pictures, so we can identify the chipset and circuitry involved in communications. Can you borrow an oscilloscope? By my back of the envelope calculation, a 16uS period suggest...
by ahull
Thu Aug 10, 2017 1:54 pm
Forum: Off topic
Topic: Short circuit generator
Replies: 22
Views: 268

Re: Short circuit generator

If your system works in a manner similar to the above schematic, then you could hook in to it with a suitable load, and relay, and pulse the relay at the required rate. You may either power your system parasitically from the line (more difficult to implement, easier to install), or run it from a sep...
by ahull
Thu Aug 10, 2017 1:32 pm
Forum: Off topic
Topic: Short circuit generator
Replies: 22
Views: 268

Re: Short circuit generator

BTW most pulse dialling doesn't rely on shorting, but rather on loop disconnect of a current loop. https://en.wikipedia.org/wiki/Pulse_dialing It is possible in these systems to dial by "flashing the hook" at the correct rate to simulate the rotary dialler, this requires a little practice, but once...
by ahull
Thu Aug 10, 2017 12:54 pm
Forum: Off topic
Topic: Short circuit generator
Replies: 22
Views: 268

Re: Short circuit generator

How short is short? In other word, do you need to crowbar the 12V with a few milliohms of short, or would a short of a few ohms, or tens of ohms be more appropriate? The reason I ask, is that a dead short will provide a huge spike of energy, as the current will be high, but a few ohms, or tens of oh...
by ahull
Thu Aug 10, 2017 11:09 am
Forum: Projects
Topic: Motion and speed detector
Replies: 30
Views: 791

Re: Motion and speed detector

I've not had much spare time recently, so I haven't pursued this topic, but some of you might find this interesting.

http://hackaday.com/2017/08/10/making-a ... t-awesome/