智能喂食器远程控制系统：硬件设计与软件实现
摘要本文深入讲解智能宠物喂食器的硬件设计、固件开发、云端控制、定时计划、食物识别等完整技术方案。一、产品需求分析1.1 核心功能功能需求描述技术实现定时投喂支持10组定时计划RTC Cron表达式远程控制APP一键投喂MQTT指令精准称重±1g精度HX711 称重传感器食量统计日/周/月统计时序数据库缺粮提醒低于阈值告警红外/超声波检测语音呼唤主人录音播放I2S 功放食物识别干粮/湿粮识别摄像头 AI防卡粮卡粮检测与处理电流检测 反转二、硬件设计2.1 系统框图┌─────────────────────────────────────────────────┐ │ ESP32-S3 主控 │ │ ┌─────────────────────────────────────────┐ │ │ │ WiFi BLE 外设接口 │ │ │ └─────────────────────────────────────────┘ │ │ │ │ │ │ │ ┌────┴────┐ ┌────┴────┐ ┌────┴────┐ │ │ │ 电机驱动│ │ 称重模块│ │ 语音模块│ │ │ │ TB6612 │ │ HX711 │ │ MAX98357│ │ │ └────┬────┘ └────┬────┘ └────┬────┘ │ │ │ │ │ │ │ ┌────┴────┐ ┌────┴────┐ ┌────┴────┐ │ │ │ 直流电机│ │ 称重传感│ │ 喇叭 │ │ │ │ 螺旋杆 │ │ 器 │ │ 麦克风 │ │ │ └─────────┘ └─────────┘ └─────────┘ │ │ │ │ ┌─────────┐ ┌─────────┐ ┌─────────┐ │ │ │ 红外检测│ │ 温湿度 │ │ 摄像头 │ │ │ │ 缺粮 │ │ 传感器 │ │ OV2640 │ │ │ └─────────┘ └─────────┘ └─────────┘ │ └─────────────────────────────────────────────────┘2.2 电机控制电路// TB6612电机驱动#defineMOTOR_IN1GPIO_NUM_1#defineMOTOR_IN2GPIO_NUM_2#defineMOTOR_PWMGPIO_NUM_3voidmotor_init(void){gpio_config_tio_conf{.pin_bit_mask(1ULLMOTOR_IN1)|(1ULLMOTOR_IN2),.modeGPIO_MODE_OUTPUT,.pull_up_enGPIO_PULLUP_DISABLE,.pull_down_enGPIO_PULLDOWN_DISABLE,.intr_typeGPIO_INTR_DISABLE};gpio_config(io_conf);// PWM配置ledc_timer_config_ttimer_conf{.speed_modeLEDC_LOW_SPEED_MODE,.timer_numLEDC_TIMER_0,.duty_resolutionLEDC_TIMER_10_BIT,.freq_hz1000,.clk_cfgLEDC_AUTO_CLK};ledc_timer_config(timer_conf);ledc_channel_config_tchannel_conf{.speed_modeLEDC_LOW_SPEED_MODE,.channelLEDC_CHANNEL_0,.timer_selLEDC_TIMER_0,.gpio_numMOTOR_PWM,.duty0,.hpoint0};ledc_channel_config(channel_conf);}voidmotor_set_speed(intspeed){// speed: -100 ~ 100if(speed0){gpio_set_level(MOTOR_IN1,1);gpio_set_level(MOTOR_IN2,0);}elseif(speed0){gpio_set_level(MOTOR_IN1,0);gpio_set_level(MOTOR_IN2,1);speed-speed;}else{gpio_set_level(MOTOR_IN1,0);gpio_set_level(MOTOR_IN2,0);}uint32_tdutyspeed*1023/100;ledc_set_duty(LEDC_LOW_SPEED_MODE,LEDC_CHANNEL_0,duty);ledc_update_duty(LEDC_LOW_SPEED_MODE,LEDC_CHANNEL_0);}2.3 称重传感器// HX711称重模块#defineHX711_SCKGPIO_NUM_4#defineHX711_DOUTGPIO_NUM_5typedefstruct{floatscale_factor;// 比例系数longoffset;// 零点偏移floatweight;// 当前重量(g)floatlast_weight;// 上次重量}hx711_t;voidhx711_init(hx711_t*hx){gpio_set_direction(HX711_SCK,GPIO_MODE_OUTPUT);gpio_set_direction(HX711_DOUT,GPIO_MODE_INPUT);hx-scale_factor1.0;hx-offset0;}longhx711_read_raw(void){// 等待数据就绪while(gpio_get_level(HX711_DOUT)1){vTaskDelay(1);}longdata0;for(inti0;i24;i){gpio_set_level(HX711_SCK,1);ets_delay_us(1);data(data1)|gpio_get_level(HX711_DOUT);gpio_set_level(HX711_SCK,0);ets_delay_us(1);}// 第25个脉冲设置增益gpio_set_level(HX711_SCK,1);ets_delay_us(1);gpio_set_level(HX711_SCK,0);// 转换为有符号数if(data0x800000){data|0xFF000000;}returndata;}floathx711_get_weight(hx711_t*hx,inttimes){longsum0;for(inti0;itimes;i){sumhx711_read_raw();}longavgsum/times;hx-weight(avg-hx-offset)/hx-scale_factor;returnhx-weight;}voidhx711_calibrate(hx711_t*hx,floatknown_weight){// 1. 空载时记录零点printf(请移除所有物品...\n);vTaskDelay(3000/portTICK_PERIOD_MS);hx-offsethx711_read_raw();printf(零点偏移: %ld\n,hx-offset);// 2. 放置已知重量物品printf(请放置 %.1fg 物品...\n,known_weight);vTaskDelay(3000/portTICK_PERIOD_MS);longreadinghx711_read_raw();// 3. 计算比例系数hx-scale_factor(reading-hx-offset)/known_weight;printf(比例系数: %.2f\n,hx-scale_factor);}三、定时投喂系统3.1 定时任务管理typedefstruct{uint8_thour;uint8_tminute;uint8_tweekdays;// 位掩码bit0周日, bit1周一...floatamount_g;// 投喂量(克)bool enabled;charvoice_msg[64];// 语音消息}feeding_schedule_t;typedefstruct{feeding_schedule_tschedules[MAX_SCHEDULES];intcount;time_tlast_feed_time;floatdaily_total;}feeding_manager_t;// 检查是否需要投喂boolcheck_schedule(feeding_manager_t*mgr){time_tnowtime(NULL);structtm*tlocaltime(now);for(inti0;imgr-count;i){feeding_schedule_t*smgr-schedules[i];if(!s-enabled)continue;// 检查时间if(t-tm_hour!s-hour||t-tm_min!s-minute)continue;// 检查星期uint8_tweekday_bit1t-tm_wday;if(!(s-weekdaysweekday_bit))continue;// 检查是否已投喂防止重复if(now-mgr-last_feed_time60)continue;// 执行投喂execute_feeding(s-amount_g,s-voice_msg);mgr-last_feed_timenow;mgr-daily_totals-amount_g;returntrue;}returnfalse;}// Cron表达式解析高级版本typedefstruct{uint8_tminute[60];// 0-59uint8_thour[24];// 0-23uint8_tday_of_month[32];// 1-31uint8_tmonth[12];// 0-11uint8_tday_of_week[7];// 0-6 (0周日)}cron_expr_t;boolcron_match(cron_expr_t*cron,structtm*t){returncron-minute[t-tm_min]cron-hour[t-tm_hour]cron-day_of_month[t-tm_mday]cron-month[t-tm_mon]cron-day_of_week[t-tm_wday];}3.2 精准投喂控制typedefstruct{floattarget_amount;// 目标投喂量floatcurrent_amount;// 当前已投喂floatstart_weight;// 开始时食盆重量bool in_progress;// 投喂进行中uint32_tstart_time;// 开始时间uint32_ttimeout_ms;// 超时时间}feeding_process_t;voidexecute_feeding(floatamount_g,constchar*voice_msg){feeding_process_tprocess{.target_amountamount_g,.current_amount0,.start_weighthx711_get_weight(hx,10),.in_progresstrue,.start_timeget_timestamp(),.timeout_ms30000// 30秒超时};// 播放语音if(voice_msg[0]!\0){play_voice(voice_msg);vTaskDelay(1000/portTICK_PERIOD_MS);}// 启动电机motor_set_speed(80);// 监控投喂量while(process.in_progress){floatcurrent_weighthx711_get_weight(hx,5);process.current_amountcurrent_weight-process.start_weight;// 达到目标量if(process.current_amountprocess.target_amount){motor_set_speed(0);process.in_progressfalse;break;}// 超时检测if(get_timestamp()-process.start_timeprocess.timeout_ms){motor_set_speed(0);report_error(ERROR_FEEDING_TIMEOUT);process.in_progressfalse;break;}// 卡粮检测if(detect_jam()){motor_set_speed(-30);// 反转vTaskDelay(500/portTICK_PERIOD_MS);motor_set_speed(80);// 重新正转}vTaskDelay(100/portTICK_PERIOD_MS);}// 记录投喂日志log_feeding(process.current_amount,process.start_time);}四、食物识别4.1 摄像头方案// OV2640摄像头初始化camera_config_tcamera_config{.pin_pwdnCAM_PIN_PWDN,.pin_resetCAM_PIN_RESET,.pin_xclkCAM_PIN_XCLK,.pin_sccb_sdaCAM_PIN_SIOD,.pin_sccb_sclCAM_PIN_SIOC,.pin_d7CAM_PIN_D7,.pin_d6CAM_PIN_D6,.pin_d5CAM_PIN_D5,.pin_d4CAM_PIN_D4,.pin_d3CAM_PIN_D3,.pin_d2CAM_PIN_D2,.pin_d1CAM_PIN_D1,.pin_d0CAM_PIN_D0,.pin_vsyncCAM_PIN_VSYNC,.pin_hrefCAM_PIN_HREF,.pin_pclkCAM_PIN_PCLK,.xclk_freq_hz20000000,.pixel_formatPIXFORMAT_JPEG,.frame_sizeFRAMESIZE_QVGA,.jpeg_quality12,.fb_count2,.grab_modeCAMERA_GRAB_LATEST};esp_err_tcamera_init(){returnesp_camera_init(camera_config);}4.2 食物类型识别# 食物识别模型classFoodTypeClassifier:def__init__(self,model_path):self.modeltflite.Interpreter(model_path)self.model.allocate_tensors()self.labels[dry_food,wet_food,treats,empty,unknown]defclassify(self,image):# 预处理input_detailsself.model.get_input_details()height,widthinput_details[0][shape][1:3]resizedcv2.resize(image,(width,height))normalizedresized/255.0input_datanp.expand_dims(normalized,axis0).astype(np.float32)# 推理self.model.set_tensor(input_details[0][index],input_data)self.model.invoke()output_detailsself.model.get_output_details()outputself.model.get_tensor(output_details[0][index])# 解析结果class_idxnp.argmax(output[0])
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