this topic while is as old as it was, it is as relevant as ever, ramps 1.4 is nearly the 'stereotype' of a '3d printer board' - all the drivers that is, the mcu is a separate affair.
these days there is ramps 1.6 (and 1.6+) basically an 'evolution' from the same 1.4 design
[
github.com]
with an additional heatsink on the mosfets
RAMPS 1.6
[
www.aliexpress.com]
[
www.aliexpress.com]
[
www.aliexpress.com]
[
www.aliexpress.com]
microcontroller board? STM32F407VET6 black - 168 mhz ARM cortex-m4 on chip fpu 512k flash 192k sram
tons of in chip hardware, on board an spi flash, a coin cell to power the real time clock, sd card slot that is sdio capable
[
stm32-base.org]
how to connect?
dupont wires
here is the plan:
* the ramps 1.4 (1.6, 1.6+ etc) board will run on 3.3v VCC, i.e. no 5v
the whole idea is so that there is no need for any 'level shifters' to interface the motor drivers, thermistors etc.
* the mosfets 'gate driver' chip
74HCT245 or
SN74LVC4245A
[
www.aliexpress.com]
74HCT245 and SN74LVC4245A are more correctly 'level shifters', note that not all 'level shifters' can drive the mosfets.
but that cmos and hcmos has a 'natural' complementary push-pull output stage design and is perfect as 'mosfet gate drivers'
[
markobakula.wordpress.com]
just that these have to be 5v logic level mosfets, it so happened that ramps style boards are.
question, would this work? or is there something else that is missed?
Edited 3 time(s). Last edit at 08/22/2021 11:44AM by ag123.
