Adafruit Sensirion SHT40 Temperature & Humidity Sensor

Adafruit Sensirion SHT40 Temperature & Humidity Sensor

(1 Reviews)

7,95 € (Net 6,68 € )

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SKU: AF4885
GTIN: 4060137069130
Category: Temperature / Humidity sensor
Manufacturers: Adafruit
MPN: 4885
Storage Tiers: Tier3

DESCRIPTION

Sensirion Temperature/Humidity sensors are some of the finest & highest-accuracy devices you can get. And finally, we have some that have a true I2C interface for easy reading. The SHT40 sensor is the fourth generation (started at the SHT10 and worked its way up to the top!). The SHT40 has an excellent ±1.8% typical relative humidity accuracy from 25 to 75% and ±0.2 °C typical accuracy from 0 to 75 °C.

Unlike some earlier SHT sensors, this sensor has a true I2C interface for easy interfacing with only two wires (plus power and ground!). Thanks to the voltage regulator and level shifting circuitry we've included on the breakout It is also is 3V or 5V compliant, so you can power and communicate with it using any microcontroller or microcomputer.

If you prefer working on a breadboard, each order comes with one fully assembled and tested PCB breakout and a small piece of header. You'll need to solder the header onto the PCB, but it's fairly easy and takes only a few minutes even for a beginner.

SHT40 Specifications

Relative humidity accuracy: up to ±1.8 %RH
Temperature accuracy: up to ±0.2 °C
Breakout supply voltage: 3.3 to 5V
Average bare sensor current: 0.4 μA (at meas. rate 1 Hz)
Idle bare sensor current: 80 nA
I2C fast mode plus, CRC checksum
Operating range: 0…100 %RH, -40…125 °C
Fully functional in condensing environment
Variable power heater
NIST traceability for sensor
JEDEC JESD47 qualification for sensor
Mature technology from global market leader Sensirion
I2C address 0x44

Storage Tiers:	Tier3
Shipping weight:	0,01 kg
Item weight:	0,01 kg
Dimensions ( Length × Width × Height ):	2,50 × 2,20 × 0,40 cm
RoHS Certificate:	compliant

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Total entries: 1

Einfach zu nutzen per MicroPython ESP32 und sehr gute Messqualität
Ich nutze den Sensor an einem NodeMCU ESP8266 an den GPIO Pins 4 und 5. Das Datenblatt des Sensors vom Hersteller hilft dabei, den Sensor einfach auszulesen.

import time
from machine import I2C
from machine import Pin

_SHT4X_DEFAULT_ADDR = const(0x44) # SHT4X I2C Address
_SHT4X_READSERIAL = const(0x89) # Read Out of Serial Register
_SHT4X_SOFTRESET = const(0x94) # Soft Reset

## create I2C object
i2c = I2C(scl=Pin(5), sda=Pin(4))
i2c_devs = i2c.scan()
for dev in i2c_devs:
print(n>> found I2C address:, dev, hex(dev))

modes = (
(SERIAL_NUMBER, 0x89, Serial number, 0.01),
(NOHEAT_HIGHPRECISION, 0xFD, No heater, high precision, 0.01),
(NOHEAT_MEDPRECISION, 0xF6, No heater, med precision, 0.005),
(NOHEAT_LOWPRECISION, 0xE0, No heater, low precision, 0.002),
(HIGHHEAT_1S, 0x39, High heat, 1 second, 1.1),
(HIGHHEAT_100MS, 0x32, High heat, 0.1 second, 0.11),
(MEDHEAT_1S, 0x2F, Med heat, 1 second, 1.1),
(MEDHEAT_100MS, 0x24, Med heat, 0.1 second, 0.11),
(LOWHEAT_1S, 0x1E, Low heat, 1 second, 1.1),
(LOWHEAT_100MS, 0x15, Low heat, 0.1 second, 0.11),
)

print (n>> getting the unique 32-bit serial number ...)
mode = modes[0]
i2c.writeto(dev, bytearray([mode[1]]))
time.sleep(mode[-1])
rx_bytes = i2c.readfrom(dev, 6)
print(>, rx_bytes, len(rx_bytes))
seno1 = rx_bytes[0:2]
seno1_crc = rx_bytes[2]
seno2 = rx_bytes[3:5]
seno2_crc = rx_bytes[5]
seno = (seno1[0] 100):
rh_pRH = 100
if (rh_pRH < 0):
rh_pRH = 0
print(> temperature:, t_degC)
print(> humidity:, rh_pRH)

Daniel M , 17.02.2023 Verified purchase