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by AwaX
Wed Mar 27, 2013 9:38 am
Forum: Automation, sensing and robotics
Topic: Generate 2 pwm signals
Replies: 33
Views: 11173

Re: Generate 2 pwm signals

@tummychow : Thank you for your response. Yes you're right, some solutions are more complicated than needed but that's what I asked, I didn't want to buy an expansive adafruit driver which have a lot of functions I won't use while there are chipper ways to do it, even if it's complicated. Because my...
by AwaX
Fri Mar 15, 2013 3:04 pm
Forum: Automation, sensing and robotics
Topic: Generate 2 pwm signals
Replies: 33
Views: 11173

Re: Generate 2 pwm signals

Ok thank you, I will read this carefully :)
by AwaX
Fri Mar 15, 2013 10:48 am
Forum: Automation, sensing and robotics
Topic: Generate 2 pwm signals
Replies: 33
Views: 11173

Re: Generate 2 pwm signals

The microcontroller way seems to be easier and cheaper but maybe I'm wrong. So with this way, I would only need to develop the UART interface with the microcontroller and the microcontroller outputs will be my PWM signals ? And will I need some extra features to program the microcontroller or just m...
by AwaX
Thu Mar 14, 2013 12:35 pm
Forum: Automation, sensing and robotics
Topic: Generate 2 pwm signals
Replies: 33
Views: 11173

Re: Generate 2 pwm signals

Yes you're rigth, it just moves the problem... In every case I need two separated signals from the RPi but the only way to do it is to use one of the interfaces (SPI or I2C). I could use a DAC but it would use too much pins. The only way is to make a SPI or I2C interface but I think it would be diff...
by AwaX
Thu Mar 14, 2013 11:37 am
Forum: Automation, sensing and robotics
Topic: Generate 2 pwm signals
Replies: 33
Views: 11173

Re: Generate 2 pwm signals

Ohh year I get it :)

But the problem is to control the voltage from the Raspberry, because it only give +5V. When you talk about the D->A converter it means that you have to make it ? Because the RPi doesn't have this.
by AwaX
Thu Mar 14, 2013 10:36 am
Forum: Automation, sensing and robotics
Topic: Generate 2 pwm signals
Replies: 33
Views: 11173

Re: Generate 2 pwm signals

So if I understand correctly, the NE555 give the triangle signal at a given frequency but how can the D->A converter from the RPi give the ratio ?
by AwaX
Wed Mar 13, 2013 7:47 pm
Forum: Automation, sensing and robotics
Topic: Generate 2 pwm signals
Replies: 33
Views: 11173

Re: Generate 2 pwm signals

Mmmh, too bad.

And is it difficult to make exactly the same as the adaboard ? I mean create a SPI interface and generate the PWM signals ?
by AwaX
Wed Mar 13, 2013 6:58 pm
Forum: Automation, sensing and robotics
Topic: Generate 2 pwm signals
Replies: 33
Views: 11173

Re: Generate 2 pwm signals

Analogue (if it's possible to interface the Raspberry with the board and give a speed command or something like that).

But I replied to your proposition just above:)
by AwaX
Wed Mar 13, 2013 6:21 pm
Forum: Automation, sensing and robotics
Topic: Generate 2 pwm signals
Replies: 33
Views: 11173

Re: Generate 2 pwm signals

Thanks a lot but I would like to make it myself because if I buy it I would't learn anything. So that's why I'm looking for some help to make my own PWM signal :)

The aTao solution seems to be the perfect way to do it but I need more details to make it.
by AwaX
Wed Mar 13, 2013 8:25 am
Forum: Automation, sensing and robotics
Topic: Generate 2 pwm signals
Replies: 33
Views: 11173

Re: Generate 2 pwm signals

@joan : It's true that my question might not be clear. By software PWM, I mean that you have to write a program (maybe C program) to generate a PWM signal on one GPIO output but it's not what I want to do. What I want to do is to programmatically control the board that generate the PWM signals, and ...
by AwaX
Tue Mar 12, 2013 3:22 pm
Forum: Automation, sensing and robotics
Topic: Generate 2 pwm signals
Replies: 33
Views: 11173

Generate 2 pwm signals

Hi, I'm actually working on a project to build a small automated robot based on 2WD Arduino platform and I'm working right now on the motor shield schematics. I would like to control two different speed for the motors but the fact is, the Raspberry can't generate two PWM signals. So do you know a wa...
by AwaX
Mon Mar 11, 2013 9:40 am
Forum: Français
Topic: Générer plusieurs signaux PWM
Replies: 5
Views: 6174

Re: Générer plusieurs signaux PWM

Oui c'est vrai que ça tourne en rond :D

Mais comment faire ?
by AwaX
Sat Mar 09, 2013 11:10 am
Forum: Français
Topic: Générer plusieurs signaux PWM
Replies: 5
Views: 6174

Re: Générer plusieurs signaux PWM

Merci pour vos réponses. Laurent, j'ai vu qu'il existait des contrôleur tout faits mais j'aimerais bien le faire moi même, ça fait longtemps que je veux approfondir mes connaissances en électronique et si c'est pas trop complexe j'aurais plein de choses à apprendre. Merci abadou pour l'info, si je n...
by AwaX
Thu Mar 07, 2013 1:40 pm
Forum: Français
Topic: Générer plusieurs signaux PWM
Replies: 5
Views: 6174

Générer plusieurs signaux PWM

Salut, Je suis en train de travailler sur un projet de petit robot basé sur la plateforme 2WD Arduino (moteurs différentiels). Je suis actuellement en train de faire les schémas électriques pour contrôler les moteurs à l'aide d'un L293D (je précise que je n'ai encore rien acheté) mais je suis confro...

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