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I have a SIM900 pcb where there is SIM Card holder. Attached is its schematic.
All the components (res,cap.) are on the top layer while the sim card holder is on bottom layer. When ever I give power to the SIM900, it responds to AT commands but when I try to do ATD<number>; it says SIM Card not...
I have a design where I am planning to use two voltage regulators. In the design SIM900 will be interfacing with PIC microcontroller. So I am planning to use LM7805 for PIC18F2520 and LM2576 for SIM900. Is there any disadvantages of using two regulators. Will it create any problem. I am new to...
Hello all,
I have a PCB where I am using SIM900 and Microcontroller. As Microcontroller runs on 5v so I am using 7805 to convert 12v to 5v. For Sim900, I am using LM2576 to provide it 4v and upto 2amps. Now I want to individually test the SIM900, so for the time being I have disabled the 7805...
I have a circuit where I am using a SIM900 GSM/GPRS module. As per the datasheet it needs 3.4 V - 4.8 V and upto 2 A of current. I am using LM2576. The input to the regulator is 12 V & 4.2 A and output (which is going to SIM900) is 4.175 V. I have connected leds for NETLIGHT and STATUS LIGHT. I...
I already thought about using LDR. But the circuit which I am talking will be placed inside a black metal body which will be fully covered and there will no provision for LDR as LDR needs to be outside. Is there any way I can control this pwm using arduino only.
Here is the image
I have a blinker circuit which turn ON & OFF 100 yellow leds using NE555 timer IC. It is working properly. Now I need to lower the intensity of yellow leds during night and increase the intensity during day. The power to the circuit is given using a solar panel. Solar panel is connected to a...
Hi BradtheRad
Till now I was confused why everyone is using PWM to charge batteries. Now its clear. Thank You. I will follow the steps you mentioned, and will tell you about it.
Hello all, I am trying to make solar charge controller using arduino. I am able to read exact volts of solar and battery voltage and I am also able to charge the battery. Problem occurs when I the battery is charged because the charging do not stop.
For ex solar volt is 13.5 and battery at...
I need to blink 150 leds at a rate of 1sec delay using NE555 timer ic. I have studied about the timer circuit and required calculation for achieving proper timing. I have used R1 as 1k and R2 as 150k with C = 10uF and its giving me 1sec on and off time. Now I need to drive 150 leds with 1sec on...
Hello
I have a PIC32 Ethernet Starter kit and I am doing its ethernet programming. I have downloaded the TCP/IP demo code and it is working fine. I am able to open the **broken link removed** website and even controlling on board led's from the website.
Now I want to make my own website and...
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