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Re: SLICs
Holtek also make a range of DTMF genrators and receivers. Check out https://www.holtek.com.tw
They also make some interesting telphone products.
Re: EPIC Programmer problem?
Mimoto
If none of the LED's are lighting up there is a problem with your circuit. I suggest you chech the circuit and our interface cable and make sure that it is right. The programming LED should light up brightly when first powering up and as soon as the Epic...
Hi
The negative oltage generator on board the lcd is used to supply a negative bias for the contrast. The one side of the contrast pot is connected to Vdd the other side to Vee (the negative voltage generator) and the wiper of the pot is connected to Vo.
Checkout the POWERTIP website for this...
pic16f877 circuit
Hi D1_DRE
The idea of using transistors to switch the RB6 and RB7 lines seems to be the best. I really like the idea. I will try it out on a new design. If you try it before I do then please let me know. I will do likewise.
Keep well
pic16f877 in-circuit programming
I have not seen another way of doing this automatically. The best isolaton is with jumpers or DIP switches. If there is another way I would also be interested. My understanding is that the high voltage only effects the /MCLR pin and not RB6 and RB7.
Good luck
For lightning the best way to protect is with two gas arrestors across the lines down to earth
------ line 1
I gas arrestor
------ earth
I gas arrestor
------ line 2
The earth must be connected to mains earth or preferably to a earth...
The easiest way to interface to the GSM network is to use a GSM modem. There are three on the market Wavecom, Connexant and Sony/Ericson. These devices offer a serial interface that uses modem like commands to set them up. You will have to interface to the serial port as well as to a SIM card...
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