finally got around to it (nrf24l0+ and servo)

On a previous post, I used the nrf24l01+ wireless chip to communicate between the Raspberry Pi and an Arduino, but only got lights to turn on.

I remember being confused as to why servos would not work, and somewhat left it there.

I started messing around with it again, and I am concluding that it might have been just a power issue.

Here is the servo moving properly:

The Arduino is on the ground due to the short length of the wires powering them.

Just as a recap, what is happening is:

- a C++ program using the RF24 library is compiled in the Raspberry Pi (connected to an nrf24l01+ chip) to broadcast a message. When executed, it will broadcast the message.
- the Arduino (connected to another nrf24l01+ chip) programmed to receive messages receives the message, and upon receipt sends a signal to an Arduino that is wired to the servo to move the servo.

Two separate Arduinos are used, as it seems that the servo library and the RF24 library do not seem to run properly together.

Anways, this finally opens up the potential of having a single Raspberry Pi control various devices in separate locations.

With these nrf24l01+ chips being as cheap as ~$2 a piece, (and ~$5 for an Arduino Pro Mini), it definitely sounds like a cheap way to automate various things around the house.

I might move out of my current apartment in a couple of weeks; maybe I'll start having the Raspberry Pi control more things around the house.

Comments

quick recollection on setting things up

If I can swear that the password is correct, then it's possible that I'm getting the ID wrong. Hadn't logged into the web server in a couple of months and was unable to SSH into it. After an hour or so, I ended up deleting the instance and recreating a clean instance (read: erasing everything). I then realized I'd been putting the wrong ID. apt-get install sudo apt-get install Anyways, some links I visited when setting things up (pretty much a dump of whatever I copy-pasted to notes) : Raspberry Pi http://www.makeuseof.com/tag/optimize-the-power-of-your-raspberry-pi-with-raspbian/ Logging http://docs.python.org/2/howto/logging-cookbook.html Tornado - Python webserver that supports Websocket http://stackoverflow.com/questions/2924991/what-popular-webservers-have-support-for-html5-websocket http://lowpowerlab.com/blog/2013/01/17/raspberrypi-websockets-with-python-tornado/ http://stackoverflow.com/questions/11695375/tornado-identify-tra...

warming up

I still don't have all the parts I need to do what I need to do, but I started working with what I had around. I had a 4-digit 7-segment led which I had ordered previously, but for the longest time I had thought I needed additional parts to make it work. It was only today that I realized that that was not the case. Getting some help from this site , I was able to get the digits fired up: This method uses way more wires than this guy (which uses a serial communications protocol called I^2C), but it's good to see it work. I still do want to try the less-wire led setup, as I would like to try playing around with I^2C. In addition, I had recently purchased an Arduino Pro Mini , which contains all the capabilities of the above Arduino Uno but requires pins/connections to be soldered into the board. I had attempted to solder one part of it (the serial/USB connections) a few days ago (note that this was my first attempt ever at soldering), and the USB-to-Serial interface...

chunk update: most parts printed and assembled

currently: stuff that happened are: wired the fingers added screws to necessary assemblies witnessed first failed print during this: servos haven't come yet, but once they do, we can start installing them into the hand/forearm. as always, credit to the Inmoov project.

the quest for robots

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