[问答]

请教sht10温湿度传感器问题

问答对人有帮助，内容完整，我也想知道答案 0 最近用一个arm的cortex-m0 MCU做一个温湿度传感器，使用的传感器芯片是SHT10,，使用过程中遇到一些问题，特发此贴寻求帮助。 1、关于硬件电路，基本上按照官方给的datasheet做的，只是VDD使用的是3.3V。 2、软件实现在下面给出，基本是官方给的样例修改的。 3、遇到的问题，温度结果过高，湿度结果过低。但是总体上是成线性的。在24~25度室温下，测出温度为30~31度，湿度更谈不上准确。在低温环境下，温度数值也立刻下降，比如放在零度左右，测得8度。 4、我想请问你们用这款传感器时温度是否需要修正，谢谢。 void SHT10_con_init() { SHT10_SCL_CFG(); SHT10_SDA_CFG(); SHT10_SCL_OUTPUT(); SHT10_SCL_LOW(); SHT10_SDA_INPUT(); SHT10_delay_half(); } void SHT10_con_wait() { SHT10_SCL_LOW(); SHT10_delay_half(); SHT10_SDA_INPUT(); SHT10_delay_half(); } void SHT10_con_reset() { uint8_t i; SHT10_SDA_OUTPUT(); SHT10_SDA_HIGH(); SHT10_SCL_LOW(); SHT10_delay_half(); for( i=0 ; i<9 ; i++ ) { SHT10_SCL_HIGH(); SHT10_delay(); SHT10_SCL_LOW(); SHT10_delay(); } SHT10_start_transfers(); } void SHT10_start_transfers() { SHT10_SDA_OUTPUT(); SHT10_SDA_HIGH(); SHT10_SCL_LOW(); SHT10_delay_half(); SHT10_SCL_HIGH(); SHT10_delay_half(); SHT10_SDA_LOW(); SHT10_delay_half(); SHT10_SCL_LOW(); SHT10_delay(); SHT10_SCL_HIGH(); SHT10_delay_half(); SHT10_SDA_HIGH(); SHT10_delay_half(); SHT10_SCL_LOW(); } int SHT10_write_byte(uint8_t data) { uint8_t i; SHT10_SDA_OUTPUT(); for (i=0x80;i>0;i>>=1) { if(i&data) { SHT10_SDA_HIGH(); } else{ SHT10_SDA_LOW(); } SHT10_delay_half(); SHT10_SCL_HIGH(); SHT10_delay(); SHT10_SCL_LOW(); SHT10_delay_half(); } SHT10_SCL_LOW(); SHT10_SDA_INPUT(); SHT10_delay(); SHT10_SCL_HIGH(); if(SHT10_SDA_READ()) { SHT10_SCL_LOW(); return -1; } SHT10_SCL_LOW(); return 0; } uint8_t SHT10_read_byte(uint8_t ack) { uint8_t i; uint8_t value; SHT10_SDA_OUTPUT(); SHT10_SDA_HIGH(); SHT10_delay_half(); SHT10_SDA_INPUT(); value = 0; for(i=0x80;i>0;i>>=1) { SHT10_SCL_HIGH(); SHT10_delay_half(); if(SHT10_SDA_READ()) { value \|=i; } ); SHT10_delay_half(); SHT10_SCL_LOW(); SHT10_delay(); } SHT10_SDA_OUTPUT(); if(ack) { SHT10_SDA_LOW(); }else{ SHT10_SDA_HIGH(); } SHT10_delay_half(); SHT10_SCL_HIGH(); SHT10_delay(); SHT10_SCL_LOW(); SHT10_SDA_INPUT(); return value; } int SHT10_reset() { SHT10_con_reset(); return SHT10_write_byte(SHT10_CMD_RESET); } int SHT10_set_status(uint8_t status) { SHT10_start_transfers(); if(SHT10_write_byte(SHT10_CMD_STATUS_WRITE)) { return -1; } return SHT10_write_byte(status); } int SHT10_read_status(uint8_t status) { uint8_t ack; SHT10_start_transfers(); if(SHT10_write_byte(SHT10_CMD_STATUS_READ)) { return -1; } status = SHT10_read_byte(1); ack = SHT10_read_byte(1); return 0; } int SHT10_temp_measure_start() { uint16_t result = 0; SHT10_start_transfers(); if(SHT10_write_byte(SHT10_CMD_TEMP_MS)) { return -1; } SHT10_con_wait(); sensor_mod = SHT10_Measure_Temperature; app_timer_start(sht10_time,MEASURE_TEMP_WAIT_TICK,NULL); return 0; } int SHT10_humi_measure_start() { uint16_t result = 0; SHT10_start_transfers(); if(SHT10_write_byte(SHT10_CMD_HUMI_MS)) { return -1; } SHT10_con_wait(); sensor_mod = SHT10_Measure_Humidity; app_timer_start(sht10_time,MEASURE_HUMI_WAIT_TICK,NULL); return 0; } /测量结果是使用一个定时器触发后再去读取的，没有使用循环等待/ int SHT10_receive_value(uint16_t value) { uint16_t data,count; uint8_t values[3] = {0,0,0}; count = 0; while(SHT10_SDA_READ()) { count++; if(count>=1000) { return -1; } nrf_delay_ms(1); } values[0] = SHT10_read_byte(1); values[1] = SHT10_read_byte(0); value = (values[0] << 8) + values[1]; return 0; } float SHT10_get_temp_value(float temp) { return (temp * 0.01 - 40.1); } float SHT10_get_humi_value(float humi) { const float c1=-4.0; // for 12 Bit const float c2=0.0405; // for 12 Bit const float c3=-2.8E-6; // for 12 Bit const float t1=0.01; // for 14 Bit @ 5V const float t2=0.00008; // for 14 Bit @ 5V float linear,value; linear = humi * humi (c3)+(humi)c2+c1; value = (temperature_value - 25.0)(t1+t2humi)+linear; return value; } void app_sht10_timeout_handler_t(void * p_context) { uint16_t result = 0; //UNUSED_PARAMETER(p_context); if(sensor_mod == SHT10_Measure_Temperature) { if(SHT10_receive_value(&result)) { sensor_mod = SHT10_ERROR; } temperature_value = SHT10_get_temp_value((float)result); SHT10_humi_measure_start(); }else if(sensor_mod == SHT10_Measure_Humidity) { if(SHT10_receive_value(&result)) { sensor_mod = SHT10_ERROR; } humidity_value = SHT10_get_humi_value((float)result); sensor_mod = SHT10_Measure_Free; is_SHT10_busy = 0; } } int SHT10_init() { uint8_t status; if(is_SHT10_busy) return -1; is_SHT10_busy = 0; nrf_delay_ms(20); SHT10_con_init(); SHT10_reset(); nrf_delay_ms(11); sensor_mod = SHT10_Measure_Free; SHT10_set_status(0); app_timer_create(&sht10_time,APP_TIMER_MODE_SINGLE_SHOT,app_sht10_timeout_handler_t); return 0; } int SHT10_measure_start() { if(is_SHT10_busy) return -1; is_SHT10_busy = 1; if(SHT10_temp_measure_start()) { SHT10_con_reset(); is_SHT10_busy = 0; return -1; } return 0; } int SHT10_pop_value(float temp,float humi) { if(is_SHT10_busy) return -1; temp = temperature_value; humi = humidity_value; return 0; } 复制代码 0
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