Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [iot]

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

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

See Wikipedia's article on Internet of Things for more information.

41 questions
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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 boot up time required that is 125 ms). I've came…
Oxmaster
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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 battery, I want to have as low a current consumption as…
KlopDesign
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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 phone, so I am using a PA1616D to be able to get…
Trev347
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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 sketch and reuploading it. The problem is when…
Hayder Ismael
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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. The central ESP32 should be able to control the…
Curious99
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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 Ghz Sx1262 - LoRa 868 Mhz Neo6Mv2 - Gps 1.5 Ghz I…
Márton Kéri
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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 analog voltage as input. How do I convert the…
this. __curious_geek
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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 for RX and 2 for TX: RFI_P: Positive differential…
Jaspal Singh Rathour
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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 with electronic components nowdays and long…
Mihailo Stefanovic
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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) Minimum voltage (~1.8V) I don't often quite see the…
nowox
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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 battery, which I intend to communicate with. On the…
Daniel Frost
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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 connector carrying I2C, SPI, etc. But it seems to have…
DamienD
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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 works perfectly fine when sending the pictures over…
Lennard
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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 there is mains voltage at the input of the lamp…
pedpx2
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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 moisture sensors and a 5v relay with the…
Julián
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