WiFi.hostname('feeder') // This will (probably) happear on your router somewhere. tSleepMode(WIFI_NONE_SLEEP) // bit more power hungry, but seems stable. We start by connecting to a WiFi network NTPClient timeClient(ntpUDP, NTP_ADDRESS, NTP_OFFSET, NTP_INTERVAL) Ĭonst char* mqtt_server = '192.168.2.85' // IP address or dns of the mqttĬonst char* lastfed_topic = 'home/feeder/lastfed' // UTF dateĬonst char* remaining_topic = 'home/feeder/remaining' //Remain % fix distance aboveĬonst char* feed_topic = 'home/feeder/feed' // command topicĬonst char* willTopic = 'home/feeder/LWT' // Last Will and Testiment topicĬonst int steps = 200 //REPLACEME this is the number of steps of the motor for a 360° rotation.ĬtServer(mqtt_server, mqtt_port) The guitar can make both high pitch and low pitch sounds. #define NTP_INTERVAL 60 * 1000 // In miliseconds A guitar string that is loose will have a low pitch and a string that is tight will have a high pitch.

Power supply for the stepper motor - 12v 3A 12V 3A Adapter with DC jack - 12V3ADCADAPTERĮSP8266 is still powered with 5v, but the plan is to add a buck converter.Ĭonst char* ssid = 'zxcvbnm' //type your WIFI information inside the quotesĬonst char* password = 'zaq12wsxcde34rfv' In the following two graphs the two sound waves have the same frequency but differ. Stepper motor - 0.55N.m - 1.5A - NEMA17 Stepper motor - 0.55N.m - 1.5A - NEMA17 - 42BYGH47-401A Looking at a graph of a sound wave, the amplitude is the height of the wave. Stepper motor driver - A4988 A4988 Motor Driver Module - A4988DRIVERMOD Second issue is that I thought I bought a motor with a high torque (0.55N.m) and it is powered with 12 volt, but I can hold/stop it from rotating with just one finger. So could an option be to somehow turn off the motor ? Guess when the motor is idle, it still has ‘power’ on to hold its positions, which is not needed. I don’t believe it is there when the stepper motor is running - it is noisy so it is hard to tell. When the stepper motor is not turning, it produces a high pitch sound. I have a setup, where I can send MQTT messages, and the stepper rotates the requested steps. It uses a ESP8266 - with a c program, that uses MQTT for ‘feeding’ tasks, and it is controlled from HA. Humans can hear sounds of different pitches, but there are sounds that they cannot hear.

Low-pitched sounds come from things that vibrate more slowly.

When an object vibrates quickly, high-pitched sounds are heard. I have built the setup, and have the electronics in place, and about to integrate it with HA. The sound an object makes changes depending on how fast it is vibrating. I’m in the process of building a feeding station for my dog. The stepper motor doesn’t seem to have a high torque - with a single finger I can stop the rotation, how to solve that ? Audio Pitch Shifter supports all popular audio formats and works with files up to 10 GB.Upload your file and start editing without compressing or reformatting it. Why does the stepper motor produce a high pitch sound when idle ?

A high pitch sound has