Open source, simple data loggers
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Price ($)OriginFeaturesBattery lifePrice notesDevelopmentSize (mm)ProcessorBoard voltageFLASH (KB)RAM (KB)Clock speed (MHz)Address width (bits)Serial portsUSB portsSleep current (mA)Battery chargingReal time clockInput power
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No-SD card logger$10@david_uwiWorks with I2C and SPI and analogue inputs>2 years on 2xAANeeds a programmer to read stored dataHope to include extra flash memory and a USB port80x40x30 (when boxed)PIC16F183263V2420.0327688000.012 with displaynoyesAnything that gives 2.7-3.3 V
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Cave Pearl Logger$15Ed Mallon designRequires soldering of Pro Mini, RTC board, µSD board, sensors. Requires an FTDI serial converter to interface with a computer.Can log for a year (field tested)for parts from eBayDevelopment is ongoing in 2017variesAtmega 328p (Pro Mini)3.3v32288100.05noDS32315v USB, 3.3v to 12v battery
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SparkFun OpenLog$15Popular as "black box" recorder for drones, RC airplanestiny, no RTCProbably a long timeMust add an RTC~19x19Atmega 328p3.3v322168102nonone3.3 to 12v
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Mini Pearl Logger$19KAPtery kit based on the Cave Pearl LoggerRequires soldering of Pro Mini, RTC board, µSD board, sensors. Requires an FTDI serial converter to interface with a computer.7 weeks so far, more in theoryA kit is available for $19 at the KAPtery. Requires soldering.Development ongoing in 2017variesAtmega 328p (Pro Mini)3.3v32288100.7noDS32315v USB, 3.3v to 12v battery
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Feather M0 Adalogger$20One Adafruit productHas attached microSD. Integrated RTC is not temperature compensated and has no battery. Can log for weeks, but unknown. 23x51ATSAMD21G18 ARM Cortex M03.3v2563248321?12?yesintegral in the processor5v USB, 3.7-4.2v LiPo battery, other?
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Cave Pearl breadboarded Uno logger$20Ed Mallon designNo soldering, mostly for classroom useprobably not more than a week or twofor parts from eBayEasy to modify100x60Atmega 328p (Uno)5v3221681145?noDS32315v USB, 5v to 12v battery
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Feather M0 & Adalogger Featherwing with RTC&µSD $29Two Adafruit productsFeatherwing has attached microSD. RTC is not temperature compensated. Can log for weeks, but unknown. total for Feather plus this FeatherwingNew Feather boards were released throughout 2016. There are lots now.23x51ATSAMD21G18 ARM Cortex M03.3v2563248321?12?yesPCF85235v USB, 3.7-4.2v LiPo battery, other?
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Feather M0 Adalogger & RTC Featherwing$34Two Adafruit products Can log for weeks, but unknown. total for Feather plus this Featherwing23x51ATSAMD21G18 ARM Cortex M03.3v2563248321?12?yesDS32315v USB, 3.7-4.2v LiPo battery, other?
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Feather 32u4 Adalogger & RTC Featherwing$36Two Adafruit productsHas attached microSD. 8 bit processor is inferior to the Feather M0 boards. RTC on featherwing is temperature compensated. Can log for weeks, but unknown. total for Feather plus this Featherwing23x51ATmega32u43.3v322881?11?yesDS32315v USB, 3.7-4.2v LiPo battery, other?
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Riffle$60publiclab.org/contributors/riffleFits in water bottle, has mosfets for turnng things off to sleep. Has physical switch to turn off USB chip when not needed.Can log for months, but untestedmaybe $40 in bulkNo further development planned19x115Atmega 328p3.3v32288110.5yesDS32315v USB, 3.7v LiPo battery, other?
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EnviroDIY Mayfly Logger$60S. Hicks designReady for Grove and I2C sensors, Xbee, WiFi, Cell, solar panels. Can log for weeks/months.Available at AmazonNew version released 2017, development is ongoing66x94Atmega 1284p3.3v12816208210.45yesDS32315v USB, 3.7v LiPo battery, 6v solar panel, 12v battery (version0.5)
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Nano Data Logger$4 + 3 for NanoNot sure, multiple clones existShield includes RTC and µSD card slot. The RTC has no alarms and is not temperature compensated. Can be deployed without soldering.probably not more than a couple of weeksA no-solder kit is available for $29 at the KAPteryOngoing deployments in 2017.~25x90Atmega 328p (Nano)5v3221681145?noDS13075v USB, 5v to 12v battery
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SkyPod GPS logger$44.00 kitKAPtery kit based on an Arduino NanoLogs GPS, temperature, and pressure data. Includes a 3D printed housing for attaching to a kite or balloon camera rig.Logs GPS data every 5 seconds for several hoursIncludes everything including a BME280 sensor. Requires soldering.Ongoing40x40x50Atmega 328p (Nano)5v3221681145?nonone (time data comes from the GPS satellites)5v USB, 5v to 12v battery
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ESP8266 breakout board$2.00 to $3.002013 IC by EspressifThe 8266 chip has built in WiFi. Simple modules with this IC are cheap and powerful. No RTC, SD card.$2.00 breakout boards have limited GPIO pins and no USB port. $3.00 boards have lots of pins and USB.Replaced by ESP32ESP82663.3-3.6v32 instruction RAM, 32 instruction cache RAM, 80 user-data RAM, 16 ETS system-data RAM8032no
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ESP32 breakout board$62016 IC by EspressifThe ESP32 chip has built in WiFi and Bluetooth. Successor to ESP8266. No RTC, SD card.$6.00 breakout boards have lots of pins, USB port.ESP323.3-3.6v520 SRAM160 or 24032The ESP32 IC has a 5uA sleep currentno
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