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Sound Generation with Atmel Chips
The title is too general. In the future, when someone wants to play 'sound' from c, we need to get him to specify if the sound is *signed 16 bit stereo pcm at 44.1KHz (sort of...
Friday, 20 January 2017 - 14:35
Technique for automatic docking.
We used vaxes in simulators. The vax 780 was widely regarded as a 1 mip machine and were the standard for a vax mip of 1667 dhrystones. They marketing dudes wouldnt let the vax...
Wednesday, 18 January 2017 - 01:58
Technique for automatic docking.
So its algorithm is random walk. Just generate random x,y coords and draw a line to them. How long until the screen is full? Answer: first its half full, then 1/4 to go, then 1/8...
Tuesday, 17 January 2017 - 18:29
Elm-chan's audio spectrum FFT program returning unexpected values
You are sampling at 9600 samples per sec. Your top freq is 4800, and you need to take 128 samples in the buffer, The first line is 0 hz, then 4800/128=37hz, then 74hz, 97hz etc....
Tuesday, 17 January 2017 - 18:12
Tachometer, trying to understand hall sensors
2700 rpm = 45 rps = 22ms. Should be able to check every rev. Timer free runs, you calc the deltat from the timer this pass - timer last pass.
Tuesday, 17 January 2017 - 17:43
Wires too long on NRF24L01s?
Thanks for that tip. I got these at the local surplus place so you must be correct. I had the transmitter sending a couple of a/d readings then a bunch of static payload. I'll rig...
Tuesday, 17 January 2017 - 17:38
Elm-chan's audio spectrum FFT program returning unexpected values
To get 48-4800Hz freq range, you sample at 9600 samps per sec for 20ms or 192 samples. Fill the buffer with a 2400 Hz sin wave to test.  
Tuesday, 17 January 2017 - 12:22
atmega or tiny with 4 input capture pins and 4 Pwm channels?
There must be a 'figure of merit' that lets you score the different solutions that meet the spec requirements. If there are several goals, there is a weighting coefficient that...
Tuesday, 17 January 2017 - 12:11
Wires too long on NRF24L01s?
I'm using the slowest spi init 0x53. I'm probably violating some timing constraint. These things work in non shockburst mode where one of em just does tx and the other just does...
Tuesday, 17 January 2017 - 00:44
Tachometer, trying to understand hall sensors
I do these r&d projects like this: use an arduino, get a program working that uses the serial port, and you can put up a menu with items like 1)measure pulse 2) calc rps 3)...
Monday, 16 January 2017 - 13:08
Proportional valve driver
How many ma to drive the valve? Get a hi output opamp.  
Sunday, 15 January 2017 - 22:43
atmega or tiny with 4 input capture pins and 4 Pwm channels?
Got a make and model for the fans?   
Sunday, 15 January 2017 - 22:40

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