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Questions tagged [parallax]

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0
votes
1answer
35 views

Parallax LRF image viewer connection timed out

I am using USB to R232 Serial interface to communicate with the parallax LRF through LRF IMage Viewer software. I have installed the drivers for RS232 and have also performed the loop back test. But ...
-5
votes
2answers
209 views

LEDs on 3.3V serial and sd card select lines

How would i go about connecting indicator LEDs to the serial lines from my MCU(a Parallax Propeller) to a MAX3232 and the chip select line for a SD card? I want the LEDs to light up when the lines are ...
2
votes
2answers
3k views

What is the difference between ISO/IEC 14443 and ISO 7816 smart cards

I am trying to build my own smart card decoder and I found that the smart card with the most popularity in terms of security and utility is the Mifare Desfire EV1 which is pretty much industrial grade....
-1
votes
1answer
796 views

Not getting data from Parallax GPS

I am trying to use a Parallax PMB-648 GPS with an Arduino Nano running this code: ...
1
vote
1answer
2k views

Arduino with Parallax RFID reader storing variables in char

I am quite new to electronics and have been tinkering around with this Arduino UNO w/ WiFi Shield and the Parallax RFID R/W Module. Link to the RFID Module: http://www.parallax.com/Store/Accessories/...
0
votes
1answer
852 views

Most efficient h bridge to run two DC motors in robotics application

EDIT: I was mistaken about the motors, I actually have a pair of DC motors I want to construct an h bridge that would allow me to control the servos in a boebot. However, I want to maximize the speed ...
2
votes
1answer
220 views

Propeller Chip with Catalina C compiler

I am working on a project using multiple MEMs sensors that communicate to a microcontroller where the data is processed before sending it serially via RF. I am using the Parallax Propeller Chip for ...
2
votes
1answer
2k views

1-Wire bus implementation in PIC18F series for Parallax ColorPAL #28380 sensors

I've bought a Parallax ColorPal 28380 color sensor, http://www.parallax.com/Portals/0/Downloads/docs/prod/sens/28380ColorPAL.pdf In the documentation above, they've used a Basic Stamp ...
1
vote
1answer
771 views

Arduino, problem with displaying RFID ID

I have recently gotten a Parallax RFID reader and I was trying to make it work with my Arduino uno. I have gotten all the necessary wires attached and I used a RFID reading program I found from Make (...
0
votes
2answers
737 views

Placing an ultrasonic sensor in a corrosive environment

A year or so ago I built a simple gauge for the fuel oil tank in my basement using a MaxSonar-EZ ultrasonic distance sensor. At some point, it stopped working, and when I removed it from the tank ...
0
votes
2answers
484 views

Having some issues with RFID reader

I just received an RFID reader from Parallax (#28440) to play with, and am having some problems getting it to send me data. I'm interfacing it with the mbed microcontroller that I also just received. ...
5
votes
6answers
1k views

What is a good way to learn the Parallax Propeller chip?

I am experimenting with the Parallax Propeller chip but don't have any ideas for projects to learn with. What are some good strategies on how to learn this chip? Are there any techniques or projects ...