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Development / Re: Interrupt voltage level
« on: June 05, 2016, 08:48:19 PM »
i am using the TLC555, which seems suitable for this application?

Development / Re: Interrupt voltage level
« on: June 05, 2016, 02:32:00 PM »
well, i was a little hasty. The USB argument might be relevant, but something else is going on.
I plugged the arduino baord directly to the computer and ran a simple sketch that reads the 555 timer on A0.
With the LED plugged in,  I get a  value of 425, without it 1023. Vcc is 5.04V. So i have voltage drop somewhere.
is it the caps? did one them burn out?   

Development / Re: Interrupt voltage level
« on: June 05, 2016, 01:26:29 PM »
hmm, seems like having a leonardo and an arduino (and other peripherals) plugged to the usb hub is not ideal ... that seems to be it.
I guess the arduino board was getting a tad less than 5V and hence everything was a tad lower? lesson learned!
The voltage is now at 2.2V. yay!

Development / Re: Interrupt voltage level
« on: June 05, 2016, 01:20:18 PM »
yes, but its seems that sometimes the Vcc is dipping below 5V, around 4.6 or so.
seems that the pot I am using is causing that, its the 10K trim pot https://www.adafruit.com/products/356
also, I rewired some connections by moving them closer to the 555 timer pins on the solderless breadboad and it got a little better? \
the rate of interrupts is not as high as the LED flashing, it goes above 2V but not reliably...?
thanks for confirming though, i'll keep digging :)

Development / Interrupt voltage level
« on: June 05, 2016, 01:09:41 AM »
I bought the parts and managed to create the sensor. The first time I did it, i used jumper cables and an arduino board and was able to see midi notes in the serial monitor.
A few weeks later, I decided to cleanup the breadboard and switch to using wires and things stopped working

1- the LED is still flashing like it used to
2- now the maximum voltage at pin 3 of the 555 timer is at 2V. I didn't measure the max voltage before the cleanup :(. Is the voltage to low to trigger a rising edge? Is it supposed to be at 3.3V with 5V Vcc?

I used a simple Arduino sketch to verify that my connections were working, and indeed I can read the voltage from the timer.
I used a multimeter and everything looks good. even measured the capacitance of each cap and the resistance of the 100k. everything is in order.
I can attach a picture of my circuit if it helps



Questions / Github?
« on: May 06, 2016, 01:19:05 AM »
Hi Sam
Have you contemplated hosting the source code on github? Do you have any reasons for not doing so? It can perhaps encourage a discussion about the software and allow folks to make their own forks.

Kit Instructions / Re: MIDIsprout Kit Build Discussion
« on: April 16, 2016, 10:25:22 AM »
cool! that makes sense about the midi merger and the interrupt vs polling.
I believe multiple interrupts might be  hard to manage as one interrupt might interrupt the other and data might be dropped from one of the sensors, right?
Polling makes sense, but what would be an acceptable state change? Is that something I would declare in code? But yeah, more inputs would require faster chip.
Also a shield would be pretty neat! as well as a wifi sprout!  Thanks again for your valuable feedback :)

Kit Instructions / Re: MIDIsprout Kit Build Discussion
« on: April 16, 2016, 01:57:17 AM »
Thank you for explaining that. If I use an Uno, which has the ATMEGA328pu chip, would it still be possible to use the code you have provided
for quantizing the signal into midi? And do you recommend wiring more than 1 Galvanometer circuit to the same board in order to sense 2 or more plants?

Kit Instructions / Re: MIDIsprout Kit Build Discussion
« on: April 11, 2016, 02:15:50 AM »
Hi Sam,

Do you provide these kits with pre programmed controllers or do you recommend that I buy the parts and put it together?
And what is your favorite store for buying parts? 

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