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I obviously have a lot of reading to do, but maybe you can help me clarify couple things.
When I ask for a web page, or if I want to send data to a web server, I use GET and POST requests.
In HTTP text inside GET and POST requests is not encoded, just plain text.
In HTTPS the text inside GET...
I've been playing with ethernet modules and sending some data on my server via HTTP POST request from my STM32F103 board. I'm currently using USR K6 module communicating via UART with AT commands. And it works. I borrowed it to my friend, who is a security freak, and he told me his home server...
I'm trying to implement a power over ethernet for my circuit, it's a simple w5500 web server that I want to power. I checked the w5500 recommended schematics on their web site. The problem is, they don't have the recommended schematic for PoE circuit. And for the last few weeks that I've been...
Yes, I forgot that capacitor.
I don't know. I was thinking about that 300kHz frequency from charge controller spreading onto maybe I2C lines. Or getting into RFM98 LoRa although it's mostly in transmit mode...
I just wanted to check if I'm missing something obvious.
Klaus, thanks for the reply. I did as you suggested. The PCB looks like this: Left top is RFM98 LoRa module, top right connector is solar input, Right side is solar charge controller, lower right is battery output. Battery should be glued on the back side of the board and should fit within the...
Hello
I'm trying to integrate a LiPo solar charge controller (CN3791) , LiPo battery, STM32G030 series microcontroller and temperature and humidity sensors. I'm wondering what's the best way to separate those items and if I should separate them on different boards. Regarding noise from...
I designed a weather station. It will have main board with electronics for everything, and 4 wires that go to one small board with only temperature sensor. Wires are 3.3V, GND, SCL, SDA. Yes, I know I2C wasn't supposed to be used between two boards, and that it's only for a short distances. Yes...
I have a small self made wireless weather station that I want to be powered by two 18650 Li Ion batteries. It uses around 10-20mA.
EDIT: I need 3.3V for my circuit. I could use single 18650, but then I would need to use very low dropout linear regulator for when battery is at let's say 3.7. So...
40 kHz is the frequency. https://www.vishay.com/docs/70051/dg417.pdf page 6 says about 100dB crosstalk isolation for 40kHz.
LTSpice simulations predict about 20mA at around 12V into the transducer. If I calculated right, that's around 0.5V lost in the switch. I can live with that.
I have a question regarding DG417/418/419 https://www.vishay.com/docs/70051/dg417.pdf
I don't quite understand V_L pin. I believe it's logic level voltage, which is in the datasheet always put to be 5V.
If I'm using 3.3V logic, should it be 3.3 or also 5?
Nice! Thanks.
Not really. Now I feel stupid :)
I live in Croatia. I know about Mouser and TME, both of them ask about 15-20 euro for shipping.
LCSC has lower shipping cost, that's why I prefer it.
I will consider other options too, it doesn't have to be switch or multiplexer or whatever it's...
I'm not sure which one I will use. TCT40-16 is the one candidate but TX and RX transducers are a bit different. Apparently TX one's impedance is lower than RX's. I have to try how bad TX will act as RX and vice versa.
1657465866
https://lcsc.com/products/Analog-Switches-Multiplexers_618.html...
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