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Re: Output Pin State During Power Up

 by Valen ¦  Wed Dec 29, 2010 3:39 pm ¦  Forum: Arduino ¦  Topic: Output Pin State During Power Up ¦  Replies: 10 ¦  Views: 8041

The first message mentions the output pin toggling at boot-up. Sounds like you forgot to implement a pull-down resistor. Or pull-up, whichever state is 'OFF' for the HV amplifier. Like a 10k resistor between output-pin and ground (pull-down) or Vcc (pull-up), the value depends on the impedance of th...

Re: Wireless positioning project

 by Valen ¦  Wed Dec 29, 2010 5:55 am ¦  Forum: Wireless/RF ¦  Topic: Wireless positioning project ¦  Replies: 24 ¦  Views: 3708

[EDIT] Sorry, I didn't read the last part of Stevetech's message in time. I really think using a (web)camera looking at the robot arena from above is the cheapest and most reliable in terms of positioning errors. The other obstacles in the arena will be just as visible as the robots. No obstructions...

Re: Range Sensor with TSOP1138, Help needed

 by Valen ¦  Mon Dec 27, 2010 11:28 am ¦  Forum: SparkFun Product Questions ¦  Topic: Range Sensor with TSOP1138, Help needed ¦  Replies: 5 ¦  Views: 1267

The frequency of IR light is in the order of 300 gigaHertz upto about 430 TeraHertz. Or a wavelength between 1mm and 0.7 micrometer. But that is not what it's function is about. It's just most sensitive to a wavelength of 950nm (0.95 micrometer) The TSOP module switches it's output if it sees a burs...

Re: Setting up a TCP/IP link over XBee (or any other serial)

 by Valen ¦  Fri Dec 24, 2010 2:14 pm ¦  Forum: Wireless/RF ¦  Topic: Setting up a TCP/IP link over XBee (or any other serial) ¦  Replies: 6 ¦  Views: 5826

My messages got removed because somehow my forum account got accidentally removed by a moderator dealing with spam-messages. If you were wondering. Anyway, I managed to get a PCMCIA netword card hooked up to the old laptop. I'm trying to get Win95 and Win7 to talk to eachother so I don't need to swa...

Re: Range Sensor with TSOP1138, Help needed

 by Valen ¦  Fri Dec 24, 2010 1:58 pm ¦  Forum: SparkFun Product Questions ¦  Topic: Range Sensor with TSOP1138, Help needed ¦  Replies: 5 ¦  Views: 1267

Unless you can feed those leds with a (38kHz) pulsed wave then those TSOP1138 will be of no use. Figure 1 clearly shows that. They are carrierwave detectors. Somehow you'll have to make an oscillator with those parts. I have a small robot that uses a very similar receiver (Sharp SFH 5110-36) for it'...

Re: GM862 i2c, how to do?

 by Valen ¦  Wed Dec 22, 2010 2:17 am ¦  Forum: Wireless/RF ¦  Topic: GM862 i2c, how to do? - WORKS NOW... ¦  Replies: 3 ¦  Views: 957

The I2C protocol requires special switching of the SDA line to indicate a start and stop condition. These are required to signal the slaves they need to pay attention (or stop when sending is finished). Did you take care of that too, or did you just send out those bytes. If those start and stop cond...

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