Bimo Anggara, IoT device engineer, Surabaya

Every node, still reporting

The board above is the shape of network I usually install: one node for each device on this page, reporting to one LoRa gateway, with alarms and any node that has gone quiet visible at a glance. The values are simulated; the ranges come from the real sensors.

Tell me what needs watching See the devices

Schematics and code handed over12 month installation warrantyNo compulsory subscription

Bimo Anggara

IoT device engineer

Surabaya, East JavaTaking new installations from March 2026

Tell me what you need

Nine years in the field

312 nodes installed and still reporting

9 years years installing monitoring

14 months months average battery life in the field

2 nodes ever lost, both to flooding

The three devices installed most often

Warehouse temperature monitor

For food and medicine stores that must log temperature. Four sensor points, reporting every three minutes, with a WhatsApp alarm when a threshold is crossed for more than ten minutes.

ESP32SHT31 sensorsLoRa SX127618650 battery5 W solar panel

Installed in 28 warehouses, reporting every three minutes. The logs are used for audits and have never been rejected by one.

Water tank monitor

Measures water level without touching the water, with an ultrasonic sensor in the tank lid. Used by housing complexes and boarding schools whose pumps run for nothing.

ESP32JSN-SR04T sensorpump relayLoRa18650 battery

Pump electricity fell by an average of 22 percent across eleven sites.

Pump vibration monitor

Reads motor vibration to catch a failing bearing before it stops suddenly. Thresholds come from the first two weeks on that machine, not from a manual.

ESP32ADXL345 accelerometerLoRa24 V supply

Three failures caught early at one factory, two of them over a weekend.

Battery life, worked out from the send interval

What I do myself

Hardware

Two layer PCB designSensor selection and calibrationPower and battery managementIP65 weatherproof enclosures

Software

C for ESP32 and STM32LoRaWAN and MQTTOver the air updatesA simple monitoring board

Field

Radio range surveyInstallation and operator trainingScheduled maintenancePlanned battery replacement

What I do not do

Phone appsMonthly cloud subscriptionsProjects with no site access

Nine years

2020 to now
Freelance engineer

Independent, Surabaya

Designing and installing monitoring for warehouses, small factories, housing complexes, and boarding schools across East Java.
2018 to 2020
Hardware engineer

An automation company

Control boards for packaging machines. Here I learned that a device an operator cannot fix is a device that dies for good.
2016 to 2018
Technician

An electrical contractor

Installing panels and pulling cable in factories. Every installation habit I have comes from those years.

Education and certification

BEng Electrical Engineering

Sepuluh Nopember Institute of Technology

2016

Electrical Installation Technician Competency

BNSP

2019

LoRaWAN Certified Professional

LoRa Alliance

2022

Tell me what needs watching

Say what you want measured, where it is, and how far the nearest power point is. Those three usually tell me the shape of the device and its cost.