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Hello Brian, thanks for the responce.
There won't be a problem with the number of tranceivers, because every node is actually a repeater. Maybe my explanation wasn't clear enough in the OP, but there is not a central ring where all the nodes connect to it. The ring actually passes through the...
Hello.
I need to implemented an RS-485 network (because at least 400m are required without repeaters at 115200bps) with 100-120 nodes. The network must be open circuit tolerant, so this means that if a single cable cut takes place, the network should continue operating normally. So the obvious...
Klaus can you thing of a way to do it with just passives? I mean there is a way if I add a bridge rectifier after the capacitor and then use an RC circuit with big time constant to activate a TRIAC.
But what I mean is if I can use a passive cicuit directly on the AC line to introduce a 15-20...
Hi Barry. Why are you saying 230mA? There is a transformerless power supply with the capacitor, so there will be voltage drop and a current limit from the capacitor itself. It is a cheap and simple circuit to drive the LED from mains.
So this is what I suspected as well, that this cannot be...
Hello all.
Below you can see a simple circuit, where DB2 is a manual switch. When it is not pressed (NC) the LED is on. When it is pressed, then the LED is off and L goes to Lout through the push switch. L and N are the two wires of the AC mains line 230V/50Hz.
What I want to do is add a...
Re: Is it possible to use debugger to debug watchdog timer?
The RAM data are irrelevant with the watchdog. You must instruct the compiler which variables should retain their values upon reset. IAR for example uses the keyword "__no_init", XC8 (MPLAB) uses the keyword "persistent" and so on...
I am using also pic18f26k20 and xc8 compier and LAT is working just fine. Below you can see a part of the code.
#define LAMP_EN_PIN LATAbits.LATA7
#define LAMP_EN_PIN_TRIS TRISAbits.TRISA7
LATA = 0;
LATB = 0;
LATC = 0;
LAMP_EN_PIN_TRIS = 0;
LAMP_EN_PIN = 1;
Thank you all, I followed the suggestion in post #3 and it worked just fine. It is kind of annoying not to have the ability to change the watchdog during runtime, but this technique can be a solution in this specific problem. Writing the configuration bits in flash is not an option for this...
In my application, I have the watchdog with 131 seconds timeout. The PIC wakes up, does some stuff and goes back to sleep. Under some circumstances, I would like to wake up not after 131 seconds, but after 10 seconds. I searched and came up to the conclusion that this is impossible to do with...
Can anyone suggest wireless mesh modules with not very high price (<10E)? There is no need to be zigbee or 6lowpan or something standarized in the higher level. It is good for the lower layers to follow IEEE802.15.4, but still not obligatory. Other important aspects is to come with a built in...
Thank you both for the detailed information. I have not yet come to a full schematic, but since I take care of the thermal issues, it won't be a problem. I have a quick diagram, you can find it attached. D1 is needed to separate the motor voltage (transformer powered or battery powered). S1...
I need to drive a 24V/27A DC motor (650W). This motor must operate even when mains power is off, so a 24V lead-acid battery will be used. The trasnformer will be 1KW. My concern is the power dissipation on bridges, diodes and mosfets when the motor is moving. The following components seem...
The ratio 3.03 is correct, but you implement the formula in a wrong way, because there is a "+1" inside it. You will confirm this with a quick web search. Use 1% resistors at worst, and have a proper grounding because even a few mV voltage drop will reduce the accuracy. Of course you must select...
Re: smps circuit and implementation
Well you need to provide schematic design and not just a photo of your breadboard. A common reason for "unexpected" voltage drop, is when the load is trying to pull more power than the supply can give.
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