DUE 3,3 V output -> 5 V

Using Arduino General Electronics
#1

Hello,

I am using a Arduino DUE for my project.

The DUE does operate with 3,3 V instead of 5 V like the other Arduino derivates.

Apparently I have a few external devices, which require 5 V to trigger them, like a relay, stepping engine driver and so on.

I could use several transistors, to convert the 3,3 V to 5 V... Never the less this is something I try to avoid.

I would like to know if there is a device to do the logical conversation between 3,3V and 5V like a 1 to 1 gatter IC or something, which is recommanded for those task.

Kind Regards,

Andreas

#2

A step-up or boost converter. Search on Ebay for : boost 5v
How is the DUE powered ? Perhaps you could use that power to make 5V.

#3

Andreas1984: I would like to know if there is a device to do the logical conversation between 3,3V and 5V like a 1 to 1 gatter IC or something, which is recommanded for those task.

you can use 74LVC245 or 74HC4050 level shifter 4-channel I2C-safe Bi-directional Logic Level Converter

#4

Hello,

I think there is a misunderstanding - I already have the 5 Volts available.

What I need to do, is to convert the logical output from the DUE -> respectively the output from 0V-3,3V to 0V-5V

I know there are devices from the 74xx IC's which can do that - I just dont know which one...

Kind Regards,

Andreas

#5

@BillHo thx for the information.

#6

74xx126 and 126 can level shift as well. One part number is SN74LVC1G125 if you like small SMDs.

Also any open-collector driver chip like the ULN280x family.

Rob

#7

Thx,

now it seams I have several options

a) 74HC126

b) 74LVC245

c) 74HC4050

Apparently I do not have a huge pool of experience working with integrated circuits, so I feel free to ask which of those level shifters you would use if you would go to drive LED's (20mA-30mA) and a RELAY (80mA-100mA) on the 5V side.

Kind Regards,

Andreas

#8

To drive LED's and RELAY you can use darlington open-collector driver chip like the ULN2003a or ULN2803a can drive about 500mA. but the low out put was about 1.1V when conducted and not 0V, however it was not a problem for LEDs and Relays.

#9

Use a logic level converter to drive other logic chips, and ULN2803 or BJTs or MOSFETs for anything needing real current. Check what current a device can source or sink before choosing it.

For relays there are probably already relay shields that will work with 3.3V but you have to check what their input current requirements are, the Due cannot produce anything like as much current as the Uno and Mega, assume 3mA max until you've checked the datasheet (different pins have different limits, note).

3mA is plenty to drive a darlington (or a MOSFET if not using high freq PWM). Its not very much though.

#10