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Recent content by Help

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    Retrieve the Email by GSM Modem SIM 800/900

    Dear all... AT // OK // 3.1 Bearer profile // Configure bearer profile 1 AT+SAPBR=3,1,"Contype","GPRS" // OK // To open a GPRS context. AT+SAPBR=3,1,"APN","3Gprepaid" // OK // To query the GPRS context AT+SAPBR=1,1 // OK // To close a GPRS context. AT+SAPBR=2,1 // +SAPBR...
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    SIM5218E Can't Turn ON

    Dear All, I have problem of life up my SIM5218E module. I have attached the schematic please someone can help me to check it. I have brought a few SIM5218E modules and it does not respond after power is up. Following is the condition list: - Accessory = Connected antenna for Sub antenna...
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    PoE In/Out Connection

    Dear All, I hope i'm post my question in the right place. Bellow diagram is showing 2 board. Board-A is PoE board and Board-B can be any embedded board with or without support PoE. P3 is the IN port and the RJ45 cable should connect from the PoE switch and P4 is the OUT port to any LAN board...
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    [51] Single master multiple slave implentation using 8051 microcontroller

    Re: I2C, Single master multiple slave implentation using 8051 microcontroller Ya i think SPI is easy to control but i need more pin SCL, MOSI, MISO, CE1, CE2, CE3,...and so on..Currently the main board just have SCL and SDA two pin to each board and my C52 have no many extra pin for SPI slave...
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    [51] Single master multiple slave implentation using 8051 microcontroller

    Re: I2C, Single master multiple slave implentation using 8051 microcontroller Ya, i have reserved the external interrupt pin at slave side. I would like to try I2C communicate among the MCU and the main board with C52 no reserve SPI port. :-( From the article i found the code is really...
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    [51] Single master multiple slave implentation using 8051 microcontroller

    Re: I2C, Single master multiple slave implentation using 8051 microcontroller hello jayanth, Thanks for your reply. I have check the link. The sample tutorial given is for Master mode. How bout Slave mode?
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    [51] Single master multiple slave implentation using 8051 microcontroller

    I2C, Single master multiple slave implentation using 8051 microcontroller Hello All, I would like to use AT89C52 as a master to interface few AT89LP4052 (slave) with using I2C. This two MCU doesn't have build in I2C feature. This few day i have do some research and can't find any useful...
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    [SOLVED] Split 2 Difference Voltage

    Ya, thanks all of you. I think that's the only where we can do. I will use the diode. ;-)
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    [SOLVED] Split 2 Difference Voltage

    Hello Goldsmith, kam1787, shatruddha and Venkadesh_M, Thanks for you all reply. Actually i have few board which is build in regulator but some of the board without power regulator. So, i would like to common up all the Vcc. That's why i'm thinking of using inductor or resistor as bridge to...
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    [SOLVED] Split 2 Difference Voltage

    Dear All, Can we share 2 difference voltage source to Load with added a Inductor or Resistor in between 2 source? The intention of connecting the Inductor/Resistor in between 2 source is either source will supply the voltage to Load A or Load B when either Regulator no output. Is it...
  11. H

    Basketball Scoreboard help?

    Hello CrOwN, I think you need a Digital Clock, two Up Counter, few switch to control the counter and clock, 7-segment driver. Try search on google then you can get the basic information from there.
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    [SOLVED] 74HC32 drive BC817 NPN transistor

    Dear All, Actually i'm using 8051 MCU to control the driver. Following is the practical result and the waveform. Wave A WA Wave B WC Wave C WB Wave D WQ 8051 port current 15mA R1 = 2K2, R3 = 2K2, WC = WA = 1.875mA * No waveform on Wave D (WQ). R1 = 10K, R3 = 2K2, WC = WA = 1.875mA Red...
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    [SOLVED] 74HC32 drive BC817 NPN transistor

    Hello keith1200rs, FvM, Thanks for your all discussion and keith1200rs: Ya, your advice is work try adding a resistor from base to ground but we still can play the R1, and R2 value around rather than base pull-low. The transistor is not too slow to come out of saturation because i did try Lo...
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    [SOLVED] 74HC32 drive BC817 NPN transistor

    Hello All, I can't make the BC817 working when i using HC32 to drive it. The transistor Collector is always Low, 0V. The NPN nominal ON and Off is just 0.92us. The NPN will work when I directly use the MCU I/O instead of using HC32. May i know what the problem is? Why the transistor can't...
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    Help me reduce the voltage at Vb in a coin battery for RTC

    Re: Coin Battery for RTC Hello Betwixt, Yeah, you can guess what I doing. Ya, i did try 1N4001 and Shottky diodes. Now then i realize. Ok, i will try to get 1N4148 and have a try. See what's the result and then get back to you ya.. Thanks a lot..
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