Tactif CIE
Well-known member
Hi people ! I need general guidance for my first project using a Teensy 3.6
The project is about building a guitar/synth stompbox (kinda electric guitar effect pedal)
Components involved are :
- Teensy 3.6
- Audio board
- An I2C LCD display
- 4 KY-040 rotary encoders (like this one)
- 6 push buttons
- 6 monochrome leds
- And of course audio IN and OUT jacks 6.35 (but that does not count as components)
As a newbie in electronics (coding is fine) I have several beliefs, some if not all might be wrong
- Stick with 3.3v components everywhere - Mixing 5v and 3.3v components is more complex, newbies will fry components or MCU
- If using the 3.3v out from the Teensy I must double check that all the components don't draw over 250 mA. If going above I might have over heat and problems
- No matter if I use the two 3.3v out, the limit is global : 250 mA
- If my components needs more than 250 mA I must use an external power supply, then it means using a 3.3v breadboard power supply like this one witch can provide up to 500 mA
- It's okay if the breadboard power supply is plugged in a 1A or 2A or XA power adapter, more Ampere is fine
- If I use a breadboard power supply I must be SURE to have cut the 5V pads as stated here : https://www.pjrc.com/teensy/external_power.html - Otherwise I will fry my expensive Mac Book USB port
- LCD I2C 3.3V display needs external pullups (I need to Google for this)
- KY-040 rotary encoders do not need anything else, they can be plugged right away into the Teensy
- Push buttons don't care about voltage
- Leds does, a 5v led on 3.3v voltage will not be bright, or even will not light up
- Leds need resistors (I need to Google for this)
- Resistors draw current, must be taken in account for PA power
- Using long wires when prototyping might be a cause of "noise", solutions exists involving resistors to reduce the noise (I need to Google for this)
- When prototype is ok on breadboard I will switch to a soldered protoboard version (I don't want to have a custom printed PCB) and this will be fine.
- Veroboards suck (I'm really not sure about this one !)
- And don't rely on really cheap components : on Amazon one KY-040 can go from 2$ to 6$ - Don't buy the cheapest (but don't buy the golden plated ones too)
Please, any advice on these points from people with skills will help me a lot !
Thanks in advance !
The project is about building a guitar/synth stompbox (kinda electric guitar effect pedal)
Components involved are :
- Teensy 3.6
- Audio board
- An I2C LCD display
- 4 KY-040 rotary encoders (like this one)
- 6 push buttons
- 6 monochrome leds
- And of course audio IN and OUT jacks 6.35 (but that does not count as components)
As a newbie in electronics (coding is fine) I have several beliefs, some if not all might be wrong
- Stick with 3.3v components everywhere - Mixing 5v and 3.3v components is more complex, newbies will fry components or MCU
- If using the 3.3v out from the Teensy I must double check that all the components don't draw over 250 mA. If going above I might have over heat and problems
- No matter if I use the two 3.3v out, the limit is global : 250 mA
- If my components needs more than 250 mA I must use an external power supply, then it means using a 3.3v breadboard power supply like this one witch can provide up to 500 mA
- It's okay if the breadboard power supply is plugged in a 1A or 2A or XA power adapter, more Ampere is fine
- If I use a breadboard power supply I must be SURE to have cut the 5V pads as stated here : https://www.pjrc.com/teensy/external_power.html - Otherwise I will fry my expensive Mac Book USB port
- LCD I2C 3.3V display needs external pullups (I need to Google for this)
- KY-040 rotary encoders do not need anything else, they can be plugged right away into the Teensy
- Push buttons don't care about voltage
- Leds does, a 5v led on 3.3v voltage will not be bright, or even will not light up
- Leds need resistors (I need to Google for this)
- Resistors draw current, must be taken in account for PA power
- Using long wires when prototyping might be a cause of "noise", solutions exists involving resistors to reduce the noise (I need to Google for this)
- When prototype is ok on breadboard I will switch to a soldered protoboard version (I don't want to have a custom printed PCB) and this will be fine.
- Veroboards suck (I'm really not sure about this one !)
- And don't rely on really cheap components : on Amazon one KY-040 can go from 2$ to 6$ - Don't buy the cheapest (but don't buy the golden plated ones too)
Please, any advice on these points from people with skills will help me a lot !
Thanks in advance !