The Hemiphterograaf is live!
Thanks to a bunch*, we achieved our goal in being able to control the penholder.
We can send serial commands to the arduino.
Connected to the arduino are the dual h-bridge chips. They each control a steppermotor.
It is a first step, but we managed it in 1,5 days.

project costs: ± € 120,- (complete list available later)
*Thanks to the code repository’s of similar open source projects & Mark who shared his crib for the purpose of tinkerdays 2012. Goodnight for now. We’ll do our best to update the program code in the “code” section of the blog as well as any kind of tutorial for those who want certain “features” of the hemiphterograaf clarified.

We have kept our cool and catched the bugs

upcoming: more photos in flickr stream

simultaneous motor movement, pulleys & penholder

More tinker footage at the photostream
So far we have managed to;

– get the steppermotors working simultaneously
– modified the pulleys so they fit onto the steppermotors
– created the penholder out of thermoplastics
– updated the code (we’ll release it in the next update)
– update the code
– fit the steppermotors onto the stand
– wire the pulleys and penholder
– try and update future code through the bluetooth shield

controlling 2 steppermotors

current state: we’ll continue the day at 24/07/2012 | 12:30 GMT

ATX power supply is connected to the breadboard. Plugged into the breadboard are the two SN754410NE H-bridge chips, 2 steppermotors (Mercury Motor SM-42BYG011-25), 1 arduino duemilanova.

Bipolar stepper circuit sheet LINK
(how to wire the chips, steppermotor and arduino alltogether)

Today will be exiting.
– With the use of thermoplastics (beats lego & meccano for certain applications) we will tinker the pen holder.
– install the arduino blue tooth shield
– update the testcode to synch the steppermotors
– complete the stand on which we will secure the steppermotors (which hold the penholder via thread)
– install the stepper motor pulleys (and pray they work, if it does, it deserves its own tutorial, more on this later)
Continue reading controlling 2 steppermotors