Updated Experimenter's Kit project guide now available

The Experimenters Kit includes an "Eleven" Arduino-compatible board, plus a range of parts and a guide to make it easy to get started with Arduino projects. [Product Page]
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andrew
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Updated Experimenter's Kit project guide now available

Post by andrew » Fri Sep 13, 2013 1:02 am

Version 1.2 of the Experimenter's Kit Project Guide is now available as a PDF. This is the version that will be in the next batch we produce, but in the meantime it's also useful for anyone who already has the kit.

Changes include:
Updated resistor colour code guide
Updated explanation of Project 2

You can grab it from the link near the bottom of the Experimenter's Kit page:

http://www.freetronics.com/expkit

Have fun!
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John

SirJefferE
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Re: Updated Experimenter's Kit project guide now available

Post by SirJefferE » Wed Jan 08, 2014 8:58 am

I posted this in another thread, but as it's related to the guide I figured I'd put it here, as far as I can tell the code provided in the guide doesn't quite work correctly, and could possibly damage your servo. (Mine spun fast and got quite hot when I tried it, but I turned it off fairly quickly.) Here is the post:


I just want to add a note here. I recently started using the servo supplied in the kit recently (I decided it would be a nice output for a speedometer experiment I'm trying out with a magnetic hall sensor attached to my stroller) and my code so far uses the timer1 library to check my speed.

Because the servo library also uses timer1, I've been looking into ways to control servos without it, but so far every source I can find says *don't* use pwm or analogWrite to control servos, and that it can damage your servo.

I'm still pretty new to servos, so don't take my word for it entirely, but I thought it was important to make a note, as the project guide advises you to use the same analogWrite script you use to pulse an LED.

Hope this helps.


From the below sources:

"You should not use the arduino analogWrite PWM function to drive a hobby servo. They do not use PWM and could damage a servo or speed controller. Its confusing because many references do incorrectly use the term PWM in articles about servos. But hobby servos and speed controllers expect different pulse timings from that provided by analogWrite."

"The analogWrite pwm output just produces a square wave with a duty cycle that can be controlled between 0% and 100%. This is not the sort of signal that a servo needs, so trying to control a servo using analogWrite is basically not going to work. You need to produce a pulse in the range of around 1ms to 2ms repeating at about every 20ms"

Sources: http://forum.arduino.cc/index.php/topic,5701.0.html
http://forum.arduino.cc/index.php/topic,193386.0.html

andrew
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Re: Updated Experimenter's Kit project guide now available

Post by andrew » Wed Jan 08, 2014 9:31 pm

Thanks for your notes, we'll work on the guide. :)

andrew
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Re: Updated Experimenter's Kit project guide now available

Post by andrew » Thu Jan 09, 2014 4:24 am

johnb wrote:Thanks for your notes, we'll work on the guide. :)
http://cdn.shopify.com/s/files/1/0045/8 ... ide1.4.pdf

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