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hi, i have to design a circuit which will control 114 leds. these leds must have different 4 current steps to change brightness. 4 current level is 5ma, 10ma, 15ma and 20 ma.
design rules are below
1. 4 current level are 5ma,10ma,15ma,20ma.
2. each led can be turned on/off individualy.
3. when...
Hi, i need a power supply circuit. I will use it for;
1- Obtain 5V 1A for microcontroller circuit
2- Obtain 12V 1A for backlight
3- Obtain 24-29V 5A for drive dc motors
4- Obtain 100mA constant charge circuit for charge 24V battery
My circuit must work with AC power source and 24v batteries. I...
for example, it is 23:35:14 (hour:minute:second)
the contents of ds1307 is
0x00: 0001 0100 (1 and 4 in bcd format)
0x01: 0011 0101 (3 and 5 in bcd format)
0x02: 0010 0011 (2 and 3 in bcd format)
if you read these addresses you obtain
20 for seconds
53 for minutes
35 for hours
to obtain real...
read the datasheet of ds1307. you will see that at it holds minutes at 0x01h address. the lower 4 bits for minutes and the other 3 bits for 10 minutes. and the last bit is empty.
after you read minute data from ds1307, you must reformat it.
Do{
minute=(minute>>4)*10+(minute&0x0F)...
Hi. i need a pcb type capacitive sensor, which will detect any object on it. I am planning to put it on a pcb, then i will put a 10mm glass on the sensor. It must have adjustable sensitivity. Do you know such a sensor.
**broken link removed**]
Hi. i need an Ir object sensor. For this i designed receiver and transmitter circuits. Transmitter circuit will produce continuous Ir pulses. When an object comes in front of sensor, it will reflect IR light to the receiver. When receiver detect Ir signal, its output will be low (logic 0). I...
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