#Adafruit trinket keyboard pro#

Sleep can interfere with the ADC, though, in that the ADC needs some time after being woken to start returning valid values. Could you put the microcontroller to sleep when it's idle? This works well if the microcontroller is the main power drain in your circuit, which it might not be - see above regarding other components.The problem with this is that the microcontroller takes some amount of time to start up, and if that's too long to be tolerable to you, then this approach doesn't work. Could you power down the microcontroller when it's idle? Like, literally turn it off? My project was motion-triggered, so I wired up the output of the motion sensor to the enable pin of my power regulator, and that resulted in the entire circuit (except for the motion sensor) being powered off when idle.

#Adafruit trinket keyboard pro#

However, the Trinket documentation doesn't say anything about being able to feed externally regulated power into the Trinket (this is part of why I used a Pro Mini - it has a pin for this purpose). You may be better off using a switching regulator instead - they can be over 90% efficient - but they are also more bulky. If you're running off a 5V battery back, over 30% of your power is going to heat in the LDO. If you are feeding 3.7V into an LDO to get to 3.3V, then over 10% of your power (1 - 3.3/3.7) is getting wasted as heat in the LDO. What is your power regulation? A Trinket has a low-dropout (LDO) regulator, which basically functions as a variable resistor.What is your power source? For a wearable, I assume you're running off a LiPo, which is generally 3.7-4.2V.Do those components have an idle state you can put them into to conserve power?.What is the power consumption of those components? You may need to go to a data sheet or to a multimeter with sub-milliamp resolution for this.What components do you have other than the trinket?.So, getting back to your questions, here are some things you should answer: Getting to that point involved doing a bunch of measurements to figure out what was eating power, and optimizing for what I actually measured. Not sure how much less because at that point I called it a day. In that case, the more you can reduce the duty cycle, and the more you can reduce the power consumption during the idle times, the less you need to worry about what happens during the active times.ДЇor example, I did a project with an Arduino Pro Mini a few years back that runs for months off a 2200mAh LiPo, meaning that its average current draw is in the ballpark of 1mA or less. Some of your other proposals - sleep, mainly - are excellent if your microcontroller doesn't have to be on all the time (that is, <100% duty cycle). Some of your proposals so far - desoldering the power LED (which isn't a stupid idea, provided that you are comfortable with that kind of soldering work), lowering the clock speed, futzing with the voltage regulator - are good ideas if your microcontroller is on and doing something 100% of the time (that is, 100% duty cycle), and therefore you need to reduce its power consumption with fixed duty cycle. Serial.So, this 100% comes down to what your controller is doing. initialize digital pin LED_BUILTIN as an output. Innerring.show() // Initialize all pixels to вЂoffвЂ™ Strip.show() // Initialize all pixels to вЂoffвЂ™ Serial.println(вЂњFailed to begin qt on pin A0вЂќ) ДotStar.begin() // Initialize pins for output NEO_GRB Pixels are wired for GRB bitstream (most NeoPixel products)TrinketMO1976! NEO_RGB Pixels are wired for RGB bitstream (v1 FLORA pixels, not v2)ДЄdafruit_NeoPixel strip = Adafruit_NeoPixel(NUM_LEDS, PIN, NEO_GRB + NEO_KHZ800) ДЄdafruit_NeoPixel innerring = Adafruit_NeoPixel(NUM_LEDS2, PIN2, NEO_GRB + NEO_KHZ800) ДЄdafruit_DotStar dotStar = Adafruit_DotStar(1, INTERNAL_DS_DATA, INTERNAL_DS_CLK, DOTSTAR_BGR) ДЄdafruit_FreeTouch qt_1 = Adafruit_FreeTouch(A0, OVERSAMPLE_4, RESISTOR_20K, FREQ_MODE_NONE) NEO_KHZ400 400 KHz (classic вЂv1вЂ™ (not v2) FLORA pixels, WS2811 drivers) NEO_KHZ800 800 KHz bitstream (most NeoPixel products w/WS2812 LEDs) Parameter 3 = pixel type flags, add together as needed: Parameter 2 = pin number (most are valid) Parameter 1 = number of pixels in strip