![]() The LED is controlled by the one circuit and the transistor side is connected with the other circuit. Typically, optical isolators a.k.a Optocoupler have two components inside a single silicon chip, a light emitting diode, and a phototransistor. Optical isolator uses lights to communicate between two independent circuits. Each Isolator has its own unique operating principle and application which are discussed below. Both these isolators protect the different ground sources from combining together. Optical and electromagnetic isolators are majorly used in signal isolation purpose. Signal isolation is done by using different type of isolators. In such cases, to isolate the individual ground of two independent power sources and to communicate between those two circuits, signal level isolation is required. For example, two circuits using independent power source and operating of different voltage levels. Signal level isolation is required where two circuits of different nature are communicating with each other using some type of signal. ![]() In this article we will learn about the different types of isolation, how they work and where to use them in our designs. There are several types of galvanic isolation techniques and choosing the right one depends on the type of isolation, withstanding capacity, application requirements and obviously, the cost factor is also involved. Why the term “Galvanic”? It is because galvanic represents the current produced by some sort of chemical action, and since we are isolating this current by breaking conductor contact it is called as Galvanic Isolation. This isolation is generally referred as Galvanic isolation. It also plays a vital role in safety by preventing fault conditions in industrial-grade products. When designing electronics products involving more than one type of signal or more than one operating voltage, isolation is used to prevent one signal from messing up the other. Have you ever wondered what prevents these high voltages from reaching out to your fingers through the buttons or casing when you touch the oven? The answer to your question is “isolation”. Besides that it also has a lower level AC voltage around 3.5V to light up the filament and a regulated DC voltage like 5V/3.3V for the digital electronics part like the display or timers to operate. Where is 1KOhm calculated for the TX resistor?Īlso for this point i got it recommended from the suppler.An average household microwave oven operating at 110/220V AC can produce upto 2800V inside it, which is dangerously lethal. i don't know got it recommended from the suppler, i don't have i high knowledge of electronic. ![]() Why are you bringing RX low when the other side brings that pin high? The Jack-Side in the picture above "Fig1"is the connection for the interface card i posted bellow.įig 1 terminal K1 go to Fig 2 Arduino side terminal J1=6įig 1 terminal K2 go to Fig 2 Arduino side terminal J1=7įig 1 terminal K3 go to Fig 2 Arduino side terminal J1=5 GND The converter connect also to the same interface with the opto-islolator as the arduino with only TX RX and GND, but off curse if i try with the arduino i remove the connection for the PC.īut for the question about inverted TTL i think maybe a schematic from this converter can help to get the answer about the inverted TTL.įig1 The schematic of the converter but this is only used if i use the computer to communicate with the meter.įig2 Interface card with the opto-islolator. Inside the DB9 connector for the pc there is a small PCB for level converting. If i use my computer to test the request to the meter i have to use a special cable. I will do some testing as you recommended. So im sure this is not the problem, and also sure my request code from the arduino to the meter is right. The opto-isolator is working just fine, i can use my computer with a special cable from the supplier to check the communication. I don't know if it's the output or indput since i can't get any answer from the device. So i hope someone have a idea or another way to get i working. I got the schematic over the heat meter where i do the interfacing, but they told me with a TTL i have to put in a 1 k Ohm resistor and a 4,7 k Ohm pull up resistor.īut this did not work, i talk again with the company and they think that a pull op resistor on the TX from the arduino will help, but i don't not know what size and how to connect it. Pin0 10kOhm resistor => Data Req "J1=6" to the interface. So now i tried to connect my arduino to the Heat meter with a resistor but no result. The problem is that i have to interface my Arduino UNO with a Heat energy meter, the meter has a interface where i won't to connect my arduino to,īut i can not get any response from the meter, so i think the problem is to "drive" the OPTO isolator. I hope someone can help me, this is a part from a post from the old forum, but i still need to get it working.
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