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1  Using Arduino / Motors, Mechanics, and Power / Re: Voltage Problem: Arduino Uno + MotoMama V2 should drive a 20V Maxon EC 32 flat on: March 21, 2013, 01:06:44 pm
yes its a shield, arduino underneath.
arduino gets power from MM, which at rhe moment gets only those 20V.

yes i set In1 and In2, and i get correct direction feedback from the indicator leds on the MM. and i get carious different voktages depending on what i send, but always 15V to little.

so i guess that the MM is fine & well fed with the 20V & GND, and it also drives the arduino, since it works without USB connection.

do you get higher voltage in & out?
i will get a 5V supply to the MM tmrw and try...

any other ideas?
2  Using Arduino / Motors, Mechanics, and Power / Re: Voltage Problem: Arduino Uno + MotoMama V2 should drive a 20V Maxon EC 32 flat on: March 21, 2013, 12:11:10 pm
hello JimboZA

thank you very much for this.

i've attached a schematic, sorry for not having more professional tools for this.

however, the motor load is 1.4 A at max, the power supply delivers 4.5 A, so here we're safe.

with "analogWrite()" i meant that i use the PWM on pin 10, with the sketch command "analogWrite(10, 255);", when i run this on the arduino i measure 4.8V on the MotoMama out. with "analogWrite(10, 128);" i get about 3V.

so i was wondering if a PWM output is never above 5V regardless of what i'm feeding, and that i should probably use another command set (which i don't know) in the sketch?

greetings
-hochnebel
3  Using Arduino / Motors, Mechanics, and Power / Voltage Problem: Arduino Uno + MotoMama V2 should drive a 20V Maxon EC 32 flat on: March 21, 2013, 11:17:56 am
hello everybody

i am working on project for which i need to drive a pair of 5-wire Maxon EC 32 flat motors (http://test.maxonmotor.com/docsx/Download/Product/Pdf/EC_32_flat_353400_Operating-Instruction_en.pdf), using a high voltage capable MotoMama V2.0 shield and an arduino uno.

The motor runs on 10..24V, i feed 20V into the MotoMama from an external source. Now, according to the MotoMama Spec whatever is fed into Vin should be available at the Motor outputs, however using the "analogWrite()" command i get not more than 4.8 V on the outputs.

Sadly, the motor will not run with less than 9V, and if i use its control input (feeding power to the motor directly, and using the MotoMama output to drive the speed control wire, which is prepared to receive between 0.33 and 10 V), then i won't be able to get to more than 50% speed.

am i missing something? i should say here that this is my first arduino project...

any help is greatly appreciated, also any suggestions on how i could alter the setup to get an easier and better result.

best wishes
-hochnebel
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