SapFlow Probe
A low-cost HRM probe for measuring a tree's water consumption
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@ I2C_SCL
I2C clock pin. Pull-up.
@ EN_5v
Control pin for 5v Power rail. Output, Active-high.
@ STATUS_LED
Built-in LED on feather. Active-high.
@ EN_3v3
Control pin for 3.3V power rail. Output, Active-low.
@ SPI_MOSI
SPI data pin. Output.
@ HEATER_CS
Heater RTD amplifier chip select. Output.
pinout
Pin definitions for our project.
@ RFM95_RST
Reset pin used for LoRa. Output. Active-low?
@ HEATER
Control pin for heater switch. Output, Active-high.
@ RFM95_CS
SPI chip select used for LoRa. Output, Active-low.
@ SPI_MISO
SPI data pin. Input.
@ UPPER_CS
Upper RTD amplifier chip select. Output.
@ RFM95_INT
Interrupt pin used for LoRa. Input. Active-low?
@ LOWER_CS
Lower RTD amplifier chip select. Output.
@ I2C_SDA
I2C data pin. Pull-up.
@ RX
Serial1 receive, used for RS232. Input.
@ SPI_SCK
SPI clock pin. Output.
@ TX
Serial1 transmit, used for RS232. Output.
@ ALARM_PIN
Interrupt pin from RTC. Pull-up, Active-low.
@ SD_CS
SPI chip select for SD card. Output, Active-low.