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quantzie

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Posts posted by quantzie

  1. grounding problem on sensor circuit

    in Electronic Projects Design/Ideas

    Posted

    Hi I am building a circuit that is the same as this on the link

    http://www.iguanalabs.com/tempture.htm

    I am using a different microchip, the ATmega88. I am supposed to transmit the data through a wireless method but for testing purposes I just connected the pin3 of the microchip to pin 11 of the max232. The max232 section I powered using USB and send the data through serial like in the page. The chip + sensor section, I power it using a power supply at 5V currently. I am not getting the data I want through Hyperterminal on the PC. If I use the same ground and voltage source for both sections, the data is transmitted properly and Hyperterminal reads the data. Is there any way to solve it? I think it is a grounding problem

  7. usb powered device

    in Electronic Projects Design/Ideas

    Posted

    My project is to create a device that will read temperatures and transmit data to the computer. My plans are to transmit the data through the serial port using the MAX232 and ATMEGA88 microchip. I do not think these are the problems but the serial port does not supply enough power for the application I am using. I want to power up the device using USB. Is it possible to just connect the pins 1 & 4 as V+ and GND to my circuit? If I am not mistaken it is 100mA and 5V supply from PC through USB.

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