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Questions tagged [iot]

For questions about designing systems with Internet of Things (IoT) devices.

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Troubleshooting power issue in LilyGo T4-S3 ESP32

I put a custom expansion board onto the nice T4-S3 devices' 2x15 header. But displaced by 1 pin (2 pins off) and shorted something out. Need help on how to troubleshoot and id the destroyed components....
Diego Alacerna's user avatar
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38 views

Battery powered IoT lightning sensor shielding

I have a low-power wireless solar powered IoT sensor that has a Geiger counter (400V SBM20 tube) on board and is controlled by ATmega328P, sitting outside. This set-up has been working great for ...
bobnecat's user avatar
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1 answer
47 views

Accessing Data through web saved on microcontroller SD card

I'm using a microcontroller (Arduino Uno) to collect sensor data and saving it in .txt format to the interfaced SD card. I would like to access this data remotely through web (WAN). Please advise on ...
Lean345's user avatar
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16 views

Are LTE-M or NB IoT Sim modules (eg from simcom) carriers restricted?

I am currently planning to build a board which will have to use LTE-M or NB-IoT technology due to their low consumption and because I do not need large data bandwidth. The targeted region is Africa. I ...
HGO's user avatar
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1 answer
200 views

How do the sx1276 radio AFC, AGC, RSSI, FEI work in FSK mode (RX)?

The sx1276 radio (https://www.semtech.fr/products/wireless-rf/lora-connect/sx1276) is commonly used in LoRA mode but it also has an FSK mode, this Q is about the FSK mode used in packet mode. This ...
TvE's user avatar
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2 answers
52 views

Power supply for IoT low power

I am designing power supply for IoT low power. The circuit is powered from 3.6V lithium battery. The system includes: MCU: STM32L151, 1.65 V -> 3.6V LTE Module: 3.4V -> 4V, Imax < 0.2 A and ...
Kay Juu's user avatar
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53 views

Voltage/current issue in a circuit

I am working on a project where I have a 3.7 V battery connected to a SIM module. The battery has a maximum voltage of 4.2V and a cutoff voltage of 2.65 V. A NodeMCU is also connected to the circuit ...
Solo's user avatar
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1 answer
83 views

How much current can the X9C103/X9C103S digital potentiometer handle?

The datasheet of the X9C103 says that the maximum active current is 3mA. Is it the maximum current that can run through the potentiometer? Actually, I am not clear about the term 'active current'. Can ...
Wanderer's user avatar
  • 179
1 vote
1 answer
62 views

POE circuit with small transformer and small volume footprint

I would like to make an isolated POE802.3af controller that can convert POE ~48V to 5V 2A, but the main problem is most designs use a standard POE transformer that has multiple coils. The problem with ...
Voltage Spike's user avatar
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29 views

Sim7600 TLS data buffer size?

I use sim7600 module's TLS layer to connect the Azure IoT hub. I have problem with tls buffer size, which is 2kb(as datasheet says). It acts unexpectedly when i try to receive message more than 2kb in ...
shota tchilaia's user avatar
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2 answers
123 views

ESP8266: Able to flash but no program execution

I designed a PCB based on the ESP8266EX dotn here is the schematic: To flash the board I use the module: https://joy-it.net/de/products/SBC-ESP8266-PROG I am able to flash the board with Arduino IDE ...
Juno's user avatar
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1 vote
0 answers
25 views

Using HM-10 module vs CC2540/1

Currently I'm trying to buy a BLE module, and the HM-10 module seems to be a module built around the CC2540 or CC2541 chips. The HM-10 module is a module that works whit UART and AT-commands, I want ...
Electromosaw's user avatar
1 vote
1 answer
135 views

How to use a Bzx55c zener diode with PTH resistor to protect analog inputs of the ADS1115 module?

I've been trying for a long time to build a circuit that serves as protection against voltage surges on the ESP32's analog ports or an analog port expansion module. I'm developing a personal ...
Gustavo Quirino's user avatar
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33 views

Issues combining SIM7600 and OV2640 camera on ESP32 dev board

I'm working on a project involving an ESP32 dev board with OV2640 connected to it over a custom designed PCB. A SIM7600 module is used to send the pictures over 4G to an external server. The camera ...
Lennard's user avatar
1 vote
1 answer
272 views

Detecting presence of mains voltage using Microcontroller, low power solution

I'm currently designing a 'smart' light switch, controllable from Microcontroller and physical switch. I am looking for a low power solution to convert signal so that the Microcontroller can detect if ...
pedpx2's user avatar
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0 answers
153 views

ESP32 PCB Layout Review

I am designing this PCB, which consists of an ESP32, with its respective 3.3v (AP2112K-3.3 Switch regulator) and 5v power supply (AP62150 Switch regulator), an RTC clock, an RS485 converter for the ...
Julián's user avatar
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1 answer
114 views

As in the picture when I connect the gnd of hlw8012 to the gnd of esp8266 I get electric shock .what should I do now

I'm working on a project based on Iot so I was using hlw8012 for power monitoring and after connecting the IC module to the esp8266 whenever I touch the Esp module I get electric shock . What should I ...
Tony's user avatar
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2 answers
446 views

ESP32 drains LIFePO4 3.2V battery, any suggestions?

I'm trying to build a smart scale using this ESP32, which is connected to a HX-711 amplifier + load-cell. It's also connected to an HC-12 RF communication sensor. Here are pictures of my setup: https:/...
Avi Levin's user avatar
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1 answer
505 views

ESP8266 not connecting to Arduino IDE

I've been trying to connect the ESP8266 Wifi module to my Arduino Leonardo and program the wifi module from it (using Arduino IDE). However, I'm not able to get the connection established! I tried ...
ludicrous's user avatar
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1 vote
1 answer
65 views

Can the PA1616D GPS module connect to a backend server to send GPS updates to a mobile phone?

I am building an IOT device that will be moving around outdoors and will not be able to have a secure wifi connection. I want to be able to know the location of this device at all times on my mobile ...
Trev347's user avatar
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0 answers
835 views

Why am I getting 255 for all NPK values?

I am using a NodeMCU ESP8266 WiFi board for collecting N - P - K sensor data. I am using RS485 as interface. This is the code: ...
Steve54's user avatar
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0 answers
84 views

WT901BLE not showing/advertising service UUID to the ESP32

We are pairing WT901BLE device with the ESP32.When WT901BLE is paired with smart phone application Reconnect then service UUID is shown. I have read on some forums that some devices don't advertise ...
Imran Mumtaz's user avatar
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2 answers
55 views

Ideas for lowest power power solution for two wireless devices to acknowledge each others presence periodically

Hi I am working on a super low power solution for two novelty items that are going to be tiny and have to have the lowest power consumption possible. Basically what I'm trying to pull off is having ...
Jeffrey's user avatar
  • 101
1 vote
0 answers
351 views

ESP32: How to change WiFi SSID using access point with Arduino IOT cloud running

I have been trying to use WiFi.h, WebServer.h and EEPROM.h together with ArduinoIoTCloud.h and Arduino_ConnectionHandler.h to be able to change the WiFi credentials if required without changing the ...
Hayder Ismael's user avatar
1 vote
3 answers
197 views

Setting up a webserver with several ESP32s

I have one central ESP32 as an access point which hosts a webserver. The goal is to display live sensor data from three more ESP32s on this webserver. These other ESP32s are implemented as stations. ...
Curious99's user avatar
  • 113
2 votes
0 answers
230 views

MCU self power off switch

I want to create a auto power off circuit for a battery powered sensor to preserve the battery. The switch will be a reed type and the trigger pulse will be brief (~70 ms is my guess, shorter than ...
Oxmaster's user avatar
  • 157
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0 answers
39 views

Uninterrupted single cell li-ion power supply design for always on IOT device

I am desigining an IoT vehicle tracker for industrial use. We have 2 stages of buck-LDO to get 48V to 3.3V. My aim is to build a UPS circuit so that a single cell Lipo can power the whole board when ...
Shivanshu Mahim's user avatar
1 vote
2 answers
143 views

Sharing multiband antenna between ICs

I am working on a ultra low power project where portability and low weight is important. The circuit would have multiple ICs, that need to communicate over multiple frequencies: Esp32 - WiFi/Bt 2.4 ...
Márton Kéri's user avatar
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2 answers
197 views

Do scientific calculators (non-graphing calculators) have a free running clock?

I am taking a course on IoT devices and I was wondering how generic calculators achieve long battery life given they operate with no more than a couple of coin cells at best. In case they have a free ...
Vibhore Jain's user avatar
0 votes
2 answers
185 views

Is it possible to use I2C fast mode+ with 30m cable?

I2C can reach up 1Mbps with fast mode+ and 3.4Mbps with High Speed mode. I just want to ask if it is possible to use 3.4Mbps mode with longer cable and what is the max. possible cable length.
alfonso's user avatar
  • 457
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0 answers
79 views

Smoothing quickly changing current/power draw for easier measurement

I want to measure the power consumption of an IoT device with LoRa module. I read quite a few posts about this topic and two issues come up regularly: the high dynamic range needed and the high ...
tschaboo's user avatar
  • 135
-1 votes
1 answer
244 views

Is it safe to PWM control a consumer smart plug or smart switch?

I was looking at a project that controls the speed of a normal off-the-shelf AC-powered house fan by plugging it up through a consumer smart plug (specifically, the Kasa ones, if that matters) and ...
reirab's user avatar
  • 103
1 vote
3 answers
214 views

How to convert hydraulic pressure gauge into analog output?

Below is the pressure gauge of the heavy equipment. The pressure gauge needle is moved by a hydraulic pressure line. We are looking to capture the hydraulic pressure into an IoT device that takes an ...
this. __curious_geek's user avatar
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0 answers
72 views

openOCD not working?

I am trying to use Zephyr RTOS with my board B_L4S5I_IOT01A. After following the getting started guide, I can't flash the .hex file into my board. This is what the terminal looks like after I tried to ...
Terrence Alvianto's user avatar
0 votes
2 answers
143 views

Doing digital IoT and some analog circuits without an oscilloscope

In my free time, I do electronic stuff as a hobby (at least for now.) I don't own an oscilloscope or a fancy multimeter due to the terrible financial state of my country. I am in Iran. In some ...
Hamidreza Kalantari's user avatar
0 votes
1 answer
346 views

Is QSPI pseudo-sram here to stay? [closed]

Doing a new design for a industrial printer that was using an expensive SRAM part on an old Hitachi part. The new Cortex M processor has limited bus pins, and we're thinking of putting a QSPI RAM on ...
Larry_C's user avatar
  • 183
0 votes
0 answers
96 views

Creating ZigBee RGB Compatible Light - Raspberry Pi

I currently have a Rasberry Pi hooked up to a 64x32 LED matrix. It runs some custom Python scripts to control the colour and display of the matrix, which works great and lets me adjust the settings ...
darthmorf's user avatar
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0 answers
352 views

Coplanar Waveguide PCB Design for 2.4 GHz signal

I tried to design a layout with 2.4 GHz Wi-Fi signal following coplanar waveguide. As far as I could understand from the online articles and videos, this is what I ended up with - https://easyeda.com/...
Abrar's user avatar
  • 83
1 vote
0 answers
109 views

ST32WL RF Matching Network

I am adapting a minimal design based on the TTN Generic Node. I am trying to reduce the BOM and do not require the option to switch power. In the following diagram there are 4 RF signal I/O pins, 2 ...
Jaspal Singh Rathour's user avatar
0 votes
3 answers
286 views

Measuring angled surface with LIDAR

I have been trying to create a sensor that detects when a golf club hits a golf ball. My idea was to have a LIDAR sensor continuously poll the head of the golf club, and return a positive indication ...
vernal123's user avatar
-2 votes
2 answers
119 views

Are SX1276 DIOx pins necessary?

This is about a SX1276 Semtech chip dev custom board: For this project, is there anything missed when not connecting any of the DIOx pins to my microcontroller? I meant, in my project I have no pins ...
Emanuel M's user avatar
  • 188
2 votes
1 answer
933 views

SIM7020 current consumption way too high

For a project I'm using the SIM7020 Narrowband-IoT (NB-IoT) module to send data to the cloud. The SIM7020 is controlled by an Arduino Pro Micro (ATmega32U4). Because the sensor is running on a ...
KlopDesign's user avatar
1 vote
1 answer
133 views

STM32 Low power series microcontroller or STM32WL series with integrated LoRA? (IoT Device)

I'm starting a design of IoT device. Trouble that I have is deciding which setup to use. I would like to someone with more experience can point me to right direction. With everything that is happening ...
Mihailo Stefanovic's user avatar
1 vote
1 answer
747 views

Providing power to NodeMCU (ESP8266) from the 5 V output of an Arduino

Is it possible to power a NodeMCU from the 5 V output of an Arduino UNO board? I was trying to use the Vin of the NodeMCU as the input from the 5 V port of the Arduino, but didn't work. Could anybody ...
Abdullah Nasir's user avatar
0 votes
1 answer
755 views

How long can I power up a nodeMCU

I have a nodeMCU esp8266 and I'm going to power up the nodeMCU as long as possible but I need to know is it good to the health of nodeMCU. In other way I am going to power the nodeMCU forever.(...
Savithu's user avatar
  • 13
1 vote
1 answer
265 views

Why are ultra low power microcontrollers 32-bit?

I am learning about ultra low power (ULP) microcontrollers and I've listed some criteria: Current consumption with only RAM retention (~70nA) Current consumption with RAM retention + RTC (~150nA) ...
nowox's user avatar
  • 847
1 vote
2 answers
155 views

SCADA communication protocol

I am a software engineer by trait and have very little knowledge of communication protocols inside surrounding PLC's. Not even sure I have a PLC at this point. I have bought a battery, a quiet big ...
Daniel Frost's user avatar
1 vote
0 answers
117 views

What happened to the M2.com standard?

I just discovered some news articles from 2016 announcing an IoT standard called "M2.com", with quite a few big names supporting it. It was basically meant to be a standard pinout for the M2 ...
DamienWontContributeToAITheft's user avatar