5 Feb
2016
5 Feb
'16
11:44 a.m.
i've discovered 5v (arduino) to 3.3v (esp8266) serial requires a logic
level shifter.
i have a max3243 <http://www.ti.com/lit/ds/symlink/max3243.pdf> with no
idea how to use it.
anyone know how to use a Multichannel RS-232 Line Driver/Receiver or
know a good circuit schematic that converts 5v-3.3v logic?
thx
~r
5 Feb
5 Feb
11:57 a.m.
these are cheap and easy to use https://www.adafruit.com/products/757
On 2016-02-05 11:44, robb wrote:
i've discovered 5v (arduino) to 3.3v (esp8266)
serial requires a logic level shifter. i have a max3243 [2] with no idea how to use it.
anyone know how to use a Multichannel RS-232 Line Driver/Receiver or
know a good circuit schematic that converts 5v-3.3v logic?
thx
~r
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[2] http://www.ti.com/lit/ds/symlink/max3243.pdf
12:12 p.m.
just connect them together with two resistors like this page says:
http://michaelteeuw.nl/post/113107637802/esp8266-no-strings-attached
ESP8266’s VCC is connected to a 3v3 power supply.
ESP8266’s GND is connected to the ground.
ESP8266’s RXD is connected to Arduino’s pin 4 using a voltage divider
(330Ω to GND, 170Ω to pin 4).
ESP8266’s TXD is connected to Arduino’s pin 5 (The Arduino can handle
3v3 just fine.)
ESP8266’s CH_PD is connected to VCC using a 10k pull up resistor.
(This will enable the wifi module.)
On Fri, 5 Feb 2016, robb wrote:
i've discovered 5v (arduino) to 3.3v (esp8266)
serial requires a logic level shifter.
i have a max3243 with no idea how to use it.
anyone know how to use a Multichannel RS-232 Line Driver/Receiver or
know a good circuit schematic that converts 5v-3.3v logic?
thx
~r
1:02 p.m.
@hol i agree, waiting a few weeks for delivery is killing me (already
ordered a couple).
@jake guess it's time to dig through the resistor box...i'm worried about
the 170Ω not being there though
hmm, chip-power-down (CH_PD) wants 10kΩ > vcc...i didn't know that.
thx all
On Fri, Feb 5, 2016 at 12:12 PM, Jake <jake(a)spaz.org> wrote:
just connect them together with two resistors like
this page says:
http://michaelteeuw.nl/post/113107637802/esp8266-no-strings-attached
ESP8266’s VCC is connected to a 3v3 power supply.
ESP8266’s GND is connected to the ground.
ESP8266’s RXD is connected to Arduino’s pin 4 using a voltage divider
(330Ω to GND, 170Ω to pin 4).
ESP8266’s TXD is connected to Arduino’s pin 5 (The Arduino can handle
3v3 just fine.)
ESP8266’s CH_PD is connected to VCC using a 10k pull up resistor.
(This will enable the wifi module.)
On Fri, 5 Feb 2016, robb wrote:
i've discovered 5v (arduino) to 3.3v (esp8266) serial requires a logic
> level shifter.
> i have a max3243 with no idea how to use it.
>
> anyone know how to use a Multichannel RS-232 Line Driver/Receiver or
> know a good circuit schematic that converts 5v-3.3v logic?
>
> thx
> ~r
>
>
1:10 p.m.
@jake guess it's time to dig through the resistor
box...i'm worried
about the 170Ω not being there though
you can use a single resistor instead (from 5V TX to 3.3V RX) but it
should be bigger, like 10K if that works, but not less than 1K.
hmm, chip-power-down (CH_PD) wants 10kΩ > vcc...i
didn't know that.
if you see other diagrams where CH_PD connects directly to Vcc it is
probably fine.
also 10K is just a random number, anything from 1K to 100K would probably
have the same effect.
-jake
10:37 p.m.
thx, got carried away by my ftdi rs-485 converter's arrival. so far, i can
dim rgb channels but the optima lighting 4 channel dimmer packs are a
different matter.
can't wait to try the dmx laser next
On Fri, Feb 5, 2016 at 1:10 PM, Jake <jake(a)spaz.org> wrote:
@jake guess it's time to dig through the resistor
box...i'm worried about
if you see other diagrams where CH_PD connects directly to Vcc it is
probably fine.
also 10K is just a random number, anything from 1K to 100K would probably
have the same effect.
-jake
the 170Ω not being there though
you can use a single resistor instead (from 5V TX to 3.3V RX) but it
should be bigger, like 10K if that works, but not less than 1K.
hmm, chip-power-down (CH_PD) wants 10kΩ > vcc...i didn't know that.
6 Feb
6 Feb
4:31 p.m.
only necessary for i2c, not serial or even spi
On Fri, 5 Feb 2016, hol(a)gaskill.com wrote:
these are cheap and easy to
use https://www.adafruit.com/products/757
On 2016-02-05 11:44, robb wrote:
i've discovered 5v (arduino) to 3.3v (esp8266) serial
requires a logic level shifter.
i have a max3243 with no idea how to use it.
anyone know how to use a Multichannel RS-232 Line Driver/Receiver
or
know a good circuit schematic that converts 5v-3.3v logic?
thx
~r
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robb