- 1,Supply Voltage: +5 V
- 2,Temperature range :0-50 °C error of ± 2 °C
- 3,Humidity :20-90% RH ± 5% RH error
- 4,No more than 1 Hz sampling rate (once every second)
- 5,2.5mA max current use during conversion (while requesting data)
Phantom YoYo Arduino compatible DHT11 Analog Temperature & Humidity Sensor
Specifications for this item
|Brand Name||Phantom YoYo|
|EAN||0600876456842 , 7785004522460 , 5509005590516 , 0787269842359 , 7336117864956|
|UPC||787269842359 , 600876456842|
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This DHT11 Temperature and Humidity Sensor features a calibrated digital signal output with the temperature and humidity sensor complex. Its technology ensures the high reliability and excellent long-term stability. A high-performance 8-bit microcontroller is connected. This sensor includes a resistive element and a sense of wet NTC temperature measuring devices. It has excellent quality, fast response, anti-interference ability and high cost performance advantages. Each DHT11 sensors features extremely accurate calibration of humidity calibration chamber. The calibration coefficients stored in the OTP program memory, internal sensors detect signals in the process, we should call these calibration coefficients. The single-wire serial interface system is integrated to become quick and easy. Small size, low power, signal transmission distance up to 20 meters, making it a variety of applications and even the most demanding applications. The product is 4-pin single row pin package. Convenient connection, special packages can be provided according to users need.
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One thing to note, the DHT11 is a fairly slow sensor, so it takes a couple seconds to read temperature and humidity changes. Not a big deal for my attic fan, but if you're looking for a real-time sensor, this isn't it.
Python example: www.uugear.com/portfolio/dht11-humidity-temperature-sensor-module/
It *is* pretty slow... it only takes about 250 milliseconds to actually read from it, but readings can be a few seconds late. Also if you move the sensor to a different environment (for example, inside to outside) it could take a while before it reflects the difference- like a minute or two- if it wasn't for that, I would have rated it 5 stars.
Keep in mind you're paying extra for the nice little package with the resistor. If you wire it yourself (just need a resistor as shown in the Adafruit tutorial) it's like $5 for the sensor. (And a few cents for the resistor)
Please note that there is a more accurate version of this sensor over a wider range: the DHT22. You can even use the same Arduino library for it. If I would have known that I probably would have bought that one instead- however, for what it's intended for, this sensor is great. I still haven't tried the DHT22- I'll have to write about the differences between the two when I do. I'll be using these sensors to build a device for my brother to help him monitor humidity in his basement.
The breakout board is really what you're paying for in this product and with that I had no issue. Now if I could just get a miracle to help me out on my next arduino project.
Update: when values came back 1 or not a number, I checked the cable before blaming the sensor. It's a tough board, surviving many inadvertent assaults. Following specific advices, I didn't have to put in a pull up resistor, as there are only three leads and 5v Vcc is ifne. The best kind of toy for kids.