, atmega328p provides an internal reference source of 1 v. When measured at room temperature, the output voltage of lm35 is several hundred MV magnitude. Therefore, an internal reference source can be used to obtain a higher measurement resolution.
If the 5 V power supply voltage is used as the reference source, the measurement resolution is 5000mV/1024 = ~ 9mV, corresponding temperature 0.49 °C;
If the
Recently used in the temperature and humidity sensor, AM2305 drive, single bus, on the power of at least 2S to read temperature and humidity, temperature accuracy is high, like DS18B20, data with the checksum, will not appear ds18b20, and the timing is not high
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://wenku.baidu.com/link?url=r_w8dizlv8cxd1s-6cml3n3kztrm9q3xegp9o6a3jjs86i_0- Mnsob8hyjvgks7c18y7upiphhwb7868g-8nm8cki4_bedkv31pf-o4z6fyJammy's code uses a lot of preprocessing, which makes code in code very readable and well worth learning, but there's a small error in the program. And Jammy was written in 09, many of the device's registrations are not registered in the new kernel.The second place is a small white predecessor:Http://blog.chinaunix.net/uid-25014876-id-59416.htmlNot much to say,
Measure the ambient temperature around the chip. The output voltage of the temperature sensor is proportional to the temperature. The obtained temperature is measured by ADC.
Inside the chip, the temperature
Marlin Temperature Sensor correction Use of type-k temperature designWill probe crawl kidnapped on the side of the heaterStart Marlin-marlin_v1\marlin\thermistortables.hTo modify the temperature of the response table in line 10thConst short TEMPTABLE_1[][2] Progmem = {After this line of workThe
Temperature Sensor driving based on ARM-LINUX (1)
Author: Feng Jian,Hua Qing vision embedded college lecturer.
DS18B20 digital temperature sensor wiring is convenient, encapsulated into can be used in a variety of occasions, such as pipe type, threaded type, magnet Adsorption Type, stainless steel encapsulation type, a
Recently used temperature and humidity sensor, AM2305 drive, single bus, after power on at least a delay of 2S to read temperature and humidity, temperature accuracy is high, with the same as DS18B20, data with calibration, will not appear ds18b20, and timing requirements are not high
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Demand:Read the value of the embedded temperature sensor.
Known conditions:* The temperature sensor has been welded on the motherboard.* Temperature Sensor Model LM75*linux Drive, in linux-2.6.20.21/drivers/hwmon/lm75.c* The circu
If you want to use the Arduino Development Board drive DHT11 to obtain temperature and humidity, it is recommended to use a third-party library, which can speed up the development of the program, and is not prone to error, the following code I have been transferred to the third-party library. For detailed installation methods, please refer to the Geek Pioneer's blog: The http://www.cnblogs.com/jikexianfeng/p/6290203.html author installs the minimum ve
functionNvic_prioritygroupconfig (nvic_prioritygroup_2);//set interrupt Priority group to group 2:2-bit preemption priority, 2-bit response priorityUart_init (115200);//serial port initialized to 115200Led_init ();//initializing the hardware interface to the LED connection while(Dht11_init ())//DHT11 Initialization{printf ("DHT11 error\r\n"); Delay_ms ( the); } while(1) { if(t% -==0)//Read once per 100ms{dht11_read_
devices can be hung on the bus, with different device addresses to access different devices. Similarly, the 1-wire bus can hang multiple devices, but it has only one line, how to differentiate between different devices.
There is a unique 64-bit long serial number inside each DS18B20, and this serial number value exists in the DS18B20 internal ROM. The first 8 bits are the product Type code (DS18B20 is 0x10), and the next 48 bits are the unique serial number for each device, and the last 8 bits
SI7021 is a temperature and humidity sensor chip produced by Silicon Labs. Its main features:
Humidity accuracy: Error typ. +/-2%RH, Max +/-3%rh (0~80%RH), factory corrected
Temperature accuracy: Error typ. +/-0.3%°c, Max +/-0.4%°c ( -10°c~85°c), factory corrected
Measuring range: Temperature range 0~1
waiting for temperature sensor response (will pull down the data cable when responding to the data sheet temperature sensor) for(i =0; i ) {counter=0; while(Digitalread (gpioport) = = lststate) {//If the current level is equal at this point, the level does not change, so continue waiting for the next cyclecounter++;d
AM2321 is a digital temperature and humidity sensor in Guangzhou ausone electronics production. Although it is a domestic brand, its precision can be comparable with foreign mainstream temperature and humidity sensing IC.
Size: 11.3x7.8x4mm (L x W x H)
Package: 0.05 pitch PTH
Operating voltage: 2.6~5v
Interface: i²c, maximum rate 100kbps, wit
Temperature Sensor + I2C + Serial Port + PC (pyserial) Example
The example is a bit messy, mainly for learning:
Temperature sensor DS18B20, E2PROM, I2C, serial port read/write, PC (pyserial) Data Display
SerialPort. py PC serial host program, you can set the maximum alarm te
The previous period of development of telemedicine system (Dr.cloud) has used over temperature and humidity sensor, but at that time considering the difficulty of integration, selected a RS485 interface sensor, the sensor realizes the Modbus RTU slave function, as long as the client program to achieve Modbus RTU The cl
Boot Root Automatic LoginIf you want to enter in the HyperTerminal, login and execute, you can add commands in the/etc/profile;If you implement an automatic login for power on, and modify it in/etc/inittab, each development board may be modified in a different way.Http://blog.chinaunix.net/uid-27717694-id-3543938.htmlAuto-run application on bootBypass login, only need to directly modify/etc/init.d/rcs a file, add a program or script command can be run automatically:Similar to Autobat automatic b
STM32 Single chip microcomputer learning (one) DS18B20 temperature sensor experiment The main realization of this programDS18B20 Temperature SensorData acquisition, and leveragingSerial CommunicationTransfer the temperature data to the computerNote: The use of the general Science and Technology Development Board test,
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