Questions tagged [long-distance]

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21 votes
8 answers
3k views

Single wire (no ground wire) long distance low frequency communication

In a cave we are currently exploring, there is a temporary siphon that sometimes blocks our way. I was thinking about monitoring it (pressure sensor or other level sensor at the siphon, transmitter ...
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5 votes
8 answers
2k views

Long-distance Arduino buttons crosstalk over Cat5e cable

I am developing a hardware system where an Arduino sits in the server room and communicates with the main computer via USB/serial. Users can push buttons at remote panels to trigger different ...
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2 votes
2 answers
182 views

level-shifting daisy-chained data line from 5V to 24V for long distance communication stability

I need to daisy chain several WS2811 chips with distances up to 20-30m in between. Every unit has a WS2811 chip that drives 3 DIO5151BCD10 LED drivers to control a high power RGB led. To account for ...
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  • 149
0 votes
1 answer
73 views

Best fit wireless technology for long range application

My project goal is to have 2 devices, a transmitter and a receiver. The transmitter should transmitter a measured distance +- every second and the receiver which could be at max. 10 miles away from ...
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1 vote
2 answers
827 views

Is it necessary to use a pull down resistor with this BTS7960?

I have an Arduino Nano controlling a BTS7960 that is 10 meters away. I have one 24V power supply. Both the Arduino and the BTS7960 get 5V through a an LM2596 step down converter. The BTS7960 "...
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  • 11
0 votes
2 answers
268 views

I2C over long distance with RJ11 CAT3 cable: how EMI noise will effect differential (but not twisted) pair wires

I have several nodes with Cat3 RJ11 cable in my office. I need to do an I2C communication between several nodes over + 20m and read about the PCA9615 driver. Unfortunately, the Cat3 RJ11 cable has ...
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0 votes
1 answer
787 views

Does the ESP32's Long Range capability work with most smartphones?

Recently discovered an ESP32 can be its own access point (controlling or displaying data wirelessly through a web browser not connected to Internet). It also has long-range capability: Long Range (LR) ...
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  • 534
0 votes
2 answers
117 views

Transmit digital signals over long distances using current (voltage to current converters)? [closed]

I want to transmit signals over a long distance wire. Let's imagine that I want to transmit the temperature information from the LM35 sensor over a long wire: instead of transmitting the voltage (...
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0 votes
2 answers
327 views

Star configuration using CAN Bus, I2C or RS485

I need to create a sensor network, with a central node receiving data from +10 different nodes, each one +20meters from the central node. So basically I need to create a star configuration, with a ...
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1 vote
0 answers
228 views

Very long distance analog audio transmission over cable

Summary: I want to transmit an audio signal (300Hz-3kHz) without modulation over a 10 km cable. I don't know how to. I have looked for a similar post and couldn't find any I hope I am not creating a ...
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0 votes
2 answers
139 views

Communication within 5-10 meters: RS-485 or Wireless?

As a follow-up for my previous question, can anyone please recommend for my application (communication between two floors of a building) as whether to use RS-485 or any wireless technique (I am ...
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6 votes
2 answers
490 views

Transmitting VCC and GND signals for use with RS-485

The specific question I want to ask is whether I can transmit VCC(5VDC) and GND power signals for powering the destination circuit (in an RS-485 arrangement) or not. The power lines will be grouped ...
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0 votes
0 answers
94 views

TCA9517DR on I2C for long distance wiring with high capacitance bus

I have a CAT6 cable that was used for old temperature sensors that works with 5V I2C at 25/30 meters from the main MCU with cable pairs that brings VCC-GND-SCL-SDA. Here is the schematic: I've tried ...
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  • 527
0 votes
1 answer
63 views

Waterproofing a cat5e/6 repair

I have a 1200 foot long outdoor direct burial network cable running through an outdoor environment that ranges from dry to 6+ ft underwater depending on the year and season. (Currently it is a foot or ...
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  • 103
1 vote
0 answers
31 views

Send a 60Hz trig signal over a 9m cable

I want to send a trig signal over a 9m cable, the signal is around 60Hz (each 15ms it sends a 1ms pulse). In order to avoid electrical interference I convert the 3.3V original signal with the ...
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  • 243
5 votes
6 answers
3k views

Understanding voltage drop

Meanwhile in quarantine I been trying to learn about electronics. I am still not able to understand the voltage drop when it comes to long wires. My goal is to be able to send a 5v signal over a very ...
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  • 547
0 votes
1 answer
181 views

Interface 24V signal from one device to 3.3V signal on another device

I have a device A that sends a signal through an optocoupler, this signal travels through a 7m cable and is used by another device B that has a SN74LVC1G17SingleSchmitt-TriggerBuffer powered by 3.3V, ...
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  • 243
0 votes
1 answer
75 views

Is it possible to use i2c accelerator to multiplexer input?

I have 10ft long wire cabled i2c 4 buses (for 8 sensors, sensor are not in the same place each has 2 i2c addresses), I try to use i2c multiplexer PCA9548A with an i2c accelerator Ltc4311, i2c ...
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  • 497
1 vote
0 answers
46 views

Noise suppress recommendation and best practices

I've developed for my home automation project this schematic: it's quite simple, an ESP32 GPIO enable pin drives those mosfets that gives power to the LED and enable the PCA9306 EN pin, for more ...
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  • 527
0 votes
1 answer
110 views

Long Range Bus for Raspberry Pi

I wish to measure the rotational speed and electrical current used of/by industrial components. Those components are driven by strong electric motors. The solution should be cheap and fast to ...
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  • 103
0 votes
1 answer
80 views

Sensor 30 meters away

for my home automation project i'm using 10 Sensirion SHT21 Temperature and Humidity devices, those devices are distant 30/50 meters away from my ESP32. Those devices are driven using 5V and at both ...
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  • 527
0 votes
1 answer
55 views

Can the button still work if being far away from Pull-Up Resistor?

Here is the illustration for pull-up resistor, I am wondering if the button still can drain the input voltage to GND when the wire between button to MCU is very long which increases the impedence of ...
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3 votes
4 answers
807 views

multiple Open Drain UART over long distance [duplicate]

I have 9 microcontrollers ATMEGA3208 and I have connected the RX and TX lines of 8 of them in parallel. My configuration is in master-slave. The master microcontroller send data to one of the 8 RX ...
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