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Voltage Regulation
I have a system which is powered by a 12VDC switch mode PS. This runs 24/7 consuming approx 100 W from the mains.
Modules connected to the system internally use a 7805 to provide a stable internal 5VDC power supply.
I am thinking of installing a solar panel to power the...
Re: SMPS problems
Good reading ;-)
Now - my power supplies are based around the Power Integrations TopSwitch204 **broken link removed** - see attached circuit diagram.
The TI UC3902 or 29002 look interesting - as does the LM5080 from National.
However because I don't have a current sense...
Hi
I have an automation network spread over a power and data bus that is about 1000 m (yards) long. Most of the equipment is is 3 panels spaced along this bus.
The power supply is provided by battery backed switched mode power supplies that output 13.8 volts - one in each panel.
Total...
Re: NIDAC PRE protocol
Hi Artem,
I'm trying to figure out the protocol before I buy onw of these.
Also, I don't want to buy their controller - but use the keypad to control my own circuit.
So I can't hook up a scope as there's nothing to hook it up too.
I was hoping somebody could post a link.
Hi
I would like to use a NIDAC PRE keypad with my system - but do not have access to the protocol used to transmit the data.
This keypad has the following keys:
0-9,*,# and E(nter)
It also has two LEDs and a piezo beeper.
It has a 4 wire interface:
- black = ground
- white = data & power
-...
picscope
Take a look at the bitscope deisgn.. The design originally won a Circuit Cellar competition.
Even though this may be a bit more highly spec'ed, there is a very good description of how things work. Also to get ideas for circuits to precondition your signal etc.
Hope this helps.
I'm building an IR remote control box using a PIC. One of the devices it must control is a Motorola DTH335 satellite box.
I have taken a look at the codes the Motorola supplied remote sends - using a universal IR capture box. These appear to be sent at 38KHz and use the NEC protocol (except...
All interrupts will vector to 0x004. At this point you need to test various flags to see what caused the interrupt and then branch accordingly.
The global interrupt flag will be cleared during the interrupt vector and re-enabled when you call RETFIE to return. This will prevent any other...
PIC is powered up at all times so it can respond to key presses. It goes to sleep after each transmission of the IR remote control code and wakes up on a key press.
My final design uses the LM2965 - which has an extremely low drop out so will allow the PIC to operate even when the batteries...
Hi,
I'm reading a 4 x 7 matrix membrane keypad . I'm using a PIC16F88 and use the PortB4:7 pins for the colums and the PortA0:7 pins for the rows.
I've set my code to setup the column pins as inputs, held high by the internal pullups. The rows are set as outputs and set to low.
In my main...
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