LTE Logger Pro · IP67 · 121 × 121 × 65 mm
findy Lab compatibleFlagshipIP67
LTE Logger Pro
The flagship findy Lab device — full industrial I/O, LTE Cat 1 bis with 2G fallback, programmable in MicroPython.
4-20 mA2× · I²C ADC · scaling + alarms
Analog IN1× 0–5 V
Pulse / Digital IN2× · counted in deep sleep
Relay2× · switched sensor rails
Sensor power3.3 V · 12 V · 24 V rails
Magnet wake-upreed switch, EXT0
LTE Cat 1 bis+ 2G fallback
GNSSon-board patch + u.FL
Solar / DC in6–30 V DC · ID 290
RS485Modbus · 120 Ω on boardAPI coming
1-Wire3.3 V rail + 4.7 kΩ pull-upAPI coming
BLE + WiFiESP32-WROOM-32UAPI coming
| Qty | 1 pc | 10–99 | 100–499 | 500+ |
|---|---|---|---|---|
| Price | €166.00 | €124.50 | €99.60 | €83.00 |
+ €25 / device / year — findy IoT Platform, global LTE SIM, OTA updates, support.
IO Architecture
Inputs, outputs and connectivity
Everything below is wired on the V.12 board and, unless marked, has a findy Lab API today. Colour indicates type.
Pulse / Digital IN ×2
Counted by the ULP co-processor — works in deep sleep · 10 kΩ · IDs 437 / 439
4-20 mA ×2
5.1 Ω shunt + INA180 → I²C ADC · per-channel scaling + min/max alarms · IDs 520 / 570
Analog IN 0–5 V ×1
3 kΩ / 1 kΩ divider → ADC · ID 582
External power sense
Measures the input voltage · ID 290, mV
Reed / magnet switch
Internal · EXT0 wake-up through the enclosure
RS485 / Modbus API coming
Half-duplex, ADM3485, 120 Ω termination on board
1-Wire ×1 API coming
Dedicated 3.3 V rail + 4.7 kΩ pull-up
External supply / solar
6–30 V DC · reverse protection · 0.5 A / 60 V polyfuse
ESP32-WROOM-32U · Xtensa LX6 dual-core
520 KB SRAM · 4 MB flash
MicroPython v1.25 · ULP co-processor
Quectel EG916Q-GL · Cat 1 bis · 2G · GNSS
External I²C ADC (addr 104) · 4 channels
30,000 sample buffer · RTC · OTA
Relay ×2
Contacts on terminals J13 / J16 · energised during measure() (ID 640)
Peripheral power
Switched sensor rail with warm-up time (ID 587)
Sensor rails 12 V + 24 V
24 V behind a 0.2 A polyfuse
Buzzer
5 kHz, 0.5 s — core.beep()
LTE Cat 1 bis / 2G
Quectel EG916Q-GL · eSIM chip + MicroSIM holder · u.FL · SMS in/out
GNSS
On-board patch antenna + u.FL · getGPS()
Battery 2× MR18650
3.6 V Li-Ion · built-in 4.2 V charger
Inputs
Outputs
Communication
Power
API coming hardware fitted, no findy Lab API yet
Terminal block
39 screw terminals, 13 blocks
3.5 mm pitch, three positions per block, as wired on the V.12 board. Top row left to right, then bottom row.
Input to the logger
Supply out to your sensor
Bus
Reserved on this board
Ground / not connected
J1
External supply| 1 | GND | |
| 2 | GND | |
| 3 | +V Ext | 6–30 V DC input · solar panel or DC supply |
J4
Analog| 1 | +3.3 V out | Peripheral rail |
| 2 | GND | |
| 3 | Analog IN | 0–5 V · ID 582 |
J7
Channel 1| 1 | Digital / pulse IN 1 | ULP counted · ID 437 |
| 2 | 4-20 mA #1 −Load | Low side of the shunt |
| 3 | 4-20 mA #1 +Load | Loop return · ID 520 |
J10
Channel 2| 1 | Digital / pulse IN 2 | ULP counted · ID 439 |
| 2 | 4-20 mA #2 −Load | Low side of the shunt |
| 3 | 4-20 mA #2 +Load | Loop return · ID 570 |
J13
Relay 2| 1 | Relay 2 | Contact |
| 2 | Relay 2 | Contact |
| 3 | Relay 2 | Contact |
J16
Relay 1| 1 | Relay 1 | Contact |
| 2 | Relay 1 | Contact |
| 3 | Relay 1 | Contact |
J19
Sensor supply| 1 | +24 V out | Behind a 0.2 A polyfuse |
| 2 | GND | |
| 3 | +12 V out |
J24
RS485| 1 | RS485 A / B | Half-duplex · API coming |
| 2 | GND | |
| 3 | RS485 A / B | 120 Ω termination on board |
J22
1-Wire| 1 | 1-Wire data | 4.7 kΩ pull-up · API coming |
| 2 | GND | |
| 3 | +3.3 V | Dedicated 1-Wire rail |
J8 · J9 · J11 · J12
Ground| 1–3 | GND | Twelve ground positions for sensor returns |
Relay contacts are yours to wireBoth relays bring their contacts to terminals. The framework energises them during
measure() when parameter 640 is set, so they double as switched sensor rails. Contact rating: see the datasheet supplied with the device.Pulses are counted while the CPU sleepsIN 1 and IN 2 are read by the ULP co-processor. Counts land in IDs 437 / 439 with ring-buffer history in 540 / 541 — no wake-ups spent on counting.
RS485 and 1-Wire are fitted, not yet in the APIThe transceiver, termination and pull-ups are on the board. Until the framework ships drivers, both are read from your own
measure() with MicroPython.One supply, three railsThe 6–30 V input charges the two Li-Ion cells and is measured as ID 290. Sensors get 3.3 V, 12 V or 24 V only for the warm-up time (ID 587) and the measurement.
Specifications
Full technical specs
Enclosure, battery and pricing as published on findyiot.com; terminals, rails and processor figures read from the V.12 schematic; firmware behaviour from the findy Lab documentation.
Physical
Dimensions121 × 121 × 65 mm
Weight325 g
IP ratingIP67
Temperature−20 °C to +40 °C
EnclosureUV protected
Terminals39 × screw, 3.5 mm pitch
Connectivity
RadioLTE Cat 1 bis + 2G fallback
ModemQuectel EG916Q-GLGNSS variant
Data rate10 Mbps DL / 5 Mbps UL
SIMeSIM chip + MicroSIM holder
GNSSOn-board patch antenna + u.FL
DiagnosticsRSSI, RSRQ, SINR, cell IDIDs 230–238
SMSSend and read via the modem
BLE / WiFiOn the ESP32 moduleNo findy Lab API yet
Power
Battery2× Li-Ion MR18650-26H, 3.6 V
ChargerBuilt-in Li-Ion charger, 4.2 V
External supply6–30 V DCSolar panel or DC · measured as ID 290
Battery life2 years @ 1 report / 24 h
Work current76 mA
Deep-sleep current10 µA
Sleep modemachine.deepsleep(), modem powered down
ProtectionReverse polarity · 0.5 A / 60 V polyfuse
Sensor rails3.3 V · 12 V · 24 V, switched
Processor & IO
CPUESP32-WROOM-32UXtensa 32-bit LX6, dual core
RuntimeMicroPython v1.25
Memory520 KB SRAM · 4 MB flash
ULP co-processorPulse counting on 2 inputs in deep sleep
ADCExternal I²C ADC, address 104, 4 channels
Buffer30,000 samplings
Wake-up period60 / 300 / 900 / 1800 / 3600 sParameter 421
Report periodParameter 422, ≥ 421
WatchdogArmed in boot.py
OTA updateDownload (ID 55) → apply (ID 52)Status ID 53
ProgrammingInternal 5-pin USB header · REPL via mpremote
findy Lab API
One file is yours
boot.py and firmware_core.mpy stay as shipped. You edit last.py: what the device measures, what it reports, and how long it sleeps.
last.py — LTE Logger Pro
Report & sleep4-20 mARelay railsPulse counting
datalist = ['582', '290', '421', '443'] # what this device reports
def start(self):
self.measure()
self.report(False, datalist) # alarm=False
self.prepareSleep(int(core.db.read('421')), True)
fw.start = start# Loop current arrives as mA on ADC channel 1.
# Scaling limits 553–556 (AIN1) and 578–581 (AIN2) are set in the platform.
ina1 = round(self.adcMeasure(b'') / 100, 2) # mA
sensor_min = float(core.db.read('553')) # 4 mA
sensor_max = float(core.db.read('554')) # 20 mA
qty_min = float(core.db.read('555')) # 0 bar
qty_max = float(core.db.read('556')) # 10 bar
qty = (ina1 - sensor_min) * ((qty_max - qty_min) /
(sensor_max - sensor_min))relay12 = machine.Pin(relay12V, machine.Pin.OUT)
relay5 = machine.Pin(relay5V, machine.Pin.OUT)
machine.Pin(PperipherialPower, machine.Pin.OUT).value(1)
if core.db.read('640') == b'1':
relay12.value(1)
relay5.value(1)
time.sleep(int(core.db.read('587'))) # sensor warm-up
# ... read the ADC channels ...
relay12.value(0)
relay5.value(0)
machine.Pin(PperipherialPower, machine.Pin.OUT).value(0)counter.initCounter() # once — loads ulp_main.bin, starts the ULP program
counter.getSamplings() # each wakeup — deltas into 437/439 + ring-buffers 540/541
# A custom parameter of your own:
databaseParams["900"] = ["W", 0, 0, 0, "0", "W"]
core.db.read('900') # read it — add '900' to datalist to report itExamples from the findy Lab documentation. Scaling limits and warm-up time are platform parameters, not code.Full API reference →
Platform preview
What you see in the findy IoT Platform
Every card below is a system parameter the framework fills in. The loop value is scaled to your engineering unit by the limits you enter in Settings — no code.
Logger Pro · Site A · Device #0042
Last report: 2 min ago
MeasurementsSettingsCommandsSystem
Analog input 1 · ID 520
12.4
mA · scaled via 553–556
Analog input 0–5 V · ID 582
3.72
V
Pulse count IN 1 · ID 437
18 432
counted through sleep
External power · ID 290
12 640
mV · solar / DC input
LTE RSSI · ID 231
−71
dBm · Cat 1 bis
Last report · ID 443
2 min ago
server-synced timestamp
Commands
System architecture
From sensor to your system
4-20 mA · pulse · 0–5 V sensors
Switched rails, warm-up, ULP counting in sleep
→
LTE Logger Pro
Your measure() runs here — MicroPython v1.25
→
LTE Cat 1 bis / 2G
Global findy SIM, embedded
→
findy IoT Platform
Measurements, settings, commands — by parameter ID
→
Your system
API, webhooks, export
Examples
Where Logger Pro fits
Each one runs on the shipped firmware — no RS485 or 1-Wire until the drivers land.
Beginner
4-20 mA pressure transmitter with scaling and alarms
Beginner
Water meter pulse counting through deep sleep
Beginner
0–5 V tank level sensor
Intermediate
Switched 12 V sensor rail with warm-up
Intermediate
Magnet-triggered field report
Next steps
Three ways to use Logger Pro
Ready-made solutions
Complete deployments built on Logger Pro — metering, level and pressure monitoring, environmental sensing — delivered and supported end to end.
View solutionsHave your own system?
We supply the logger and the SIM. You take the data from the platform API into the infrastructure you already run.
Talk to our team →Write your own logic
You're here. Wire the terminals, edit one file, deploy the next version over the air.
Can't do it? Enterprise team →