bids are invited for mpu-6050 3-axis accelerometer and gyroscope sensor - na , water sensor - for measuring dissolved oxygen, oxidation-reduction potential, ph, conductivity and temperature; sensor type: galvanic cell, range: 0 to 20 mg / l, accuracy: + / - 2%, maximum operation temperature: 50 degree c, response time: after equilibration 2 minutes to 20 mv. , mq-2 smoke lpg butane hydrogen gas sensor detector module - two-way signal output ( analog output and ttl level output ) ttl output, low level for valid signal. ( when output low level, signal light is on, can directly connect mcu ) analog output 0 ~ 5v voltage, the higher the concentration, the higher the voltage. , us-100 ultrasonic sensor distance measuring module with temperature compensation - na , sound sensor - low power, highly accurate, wide range , flame sensor module / 5-channel flame sensor module - na , raindrops detection sensor module with 12v relay module - na , gy-271 hmc5883l 3-axis electronic compass module magnetic field sensor - original chip - na , bmp180 digital barometric sensor module compatible with arduino - na , infrared obstacle avoidance ir sensor module- good quality - na , temperature, humidity and pressure sensor - temperature measurement range: -40 to +85 degree c, humidity measurement range: 0 to 100 % hr, pressure measurement: 30 to 110 kpa , carbon monoxide ( co ) sensor - low power, highly accurate, wide range , sound detector sensor - low power, highly accurate, wide range , ir sensor module kit ( 230m long range ) - na , water temperature sensor - temperature range from -55°c to +125°c, with ±0.5°c accuracy from -10°c to +85°c. , water ph sensor probe - with ph caliberation kit and single junction reference probe , soil moisture sensor 1, 5m - high resolution, durable, stable and reliable, industrial level gadget, serial two wire interface, individually caliberated , tilt sensor vibration alarm vibration switch module for arduino - low power, highly accurate, wide range , touch switch sensor module double sided touchpad 4p / 3p interface - na , ds3231 rtc module precise real time clock i2c at24c32 - na total quantity : 1