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PINOUT

Electrical Specification

obniz IO Physical IO Drive Method Internal Weak Pull Up/Down Internal connected
io0 GPIO0 Input 3.3v(default)
Output push-pull3v
Output open-drain		 (fixed internal pullup)
io2 GPIO2 Input 3.3v(default)
Output push-pull3v
Output open-drain		 (fixed internal pulldown)
io4 GPIO4 Input 3.3v(default)
Output push-pull3v
Output open-drain		 (fixed internal pullup) TFCard
io5 GPIO5 Input 3.3v(default)
Output push-pull3v
Output open-drain		 (fixed internal pullup)
io12 GPIO12 Input 3.3v(default)
Output push-pull3v
Output open-drain		 float(default)
pull-up to 3v
pull-down to 0v
io13 GPIO13 Input 3.3v(default)
Output push-pull3v
Output open-drain		 float(default)
pull-up to 3v
pull-down to 0v
io14 GPIO14 Input 3.3v(default)
Output push-pull3v
Output open-drain		 float(default)
pull-up to 3v
pull-down to 0v		 LCD
io15 GPIO15 Input 3.3v(default)
Output push-pull3v
Output open-drain		 (fixed internal pullup)
io16 GPIO16 Input 3.3v(default)
Output push-pull3v
Output open-drain		 float(default)
pull-up to 3v
pull-down to 0v
io17 GPIO17 Input 3.3v(default)
Output push-pull3v
Output open-drain		 float(default)
pull-up to 3v
pull-down to 0v
io18 GPIO18 Input 3.3v(default)
Output push-pull3v
Output open-drain		 (fixed internal pullup) TFCard, LCD
io19 GPIO19 Input 3.3v(default)
Output push-pull3v
Output open-drain		 (fixed internal pullup) TFCard
io21 GPIO21 Input 3.3v(default)
Output push-pull3v
Output open-drain		 float(default)
pull-up to 3v
pull-down to 0v		 Grove, BatteryIC, MotionTracking / Geomagnetic Sensor(M5StackGray)
io22 GPIO22 Input 3.3v(default)
Output push-pull3v
Output open-drain		 float(default)
pull-up to 3v
pull-down to 0v		 Grove, BatteryIC, MotionTracking / Geomagnetic Sensor(M5StackGray)
io23 GPIO23 Input 3.3v(default)
Output push-pull3v
Output open-drain		 (fixed internal pullup) TFCard, LCD
io25 GPIO25 Input 3.3v(default)
Output push-pull3v
Output open-drain		 float(default)
pull-up to 3v
pull-down to 0v		 Speaker
io26 GPIO26 Input 3.3v(default)
Output push-pull3v
Output open-drain		 float(default)
pull-up to 3v
pull-down to 0v
io27 GPIO27 Input 3.3v(default)
Output push-pull3v
Output open-drain		 float(default)
pull-up to 3v
pull-down to 0v		 LCD
io32 GPIO32 Input 3.3v(default)
Output push-pull3v
Output open-drain		 (fixed internal pulldown) LCD
io33 GPIO33 Input 3.3v(default)
Output push-pull3v
Output open-drain		 float(default)
pull-up to 3v
pull-down to 0v		 LCD
io34 GPIO34 Input 3.3v(default) float(default)
pull-up to 3v
pull-down to 0v
io35 GPIO35 Input 3.3v(default) float(default)
pull-up to 3v
pull-down to 0v
io36 GPIO36 Input 3.3v(default) float(default)
pull-up to 3v
pull-down to 0v
io37 GPIO37 Input 3.3v(default) (fixed internal pullup) ButtonC
io38 GPIO38 Input 3.3v(default) (fixed internal pullup) ButtonB
io39 GPIO39 Input 3.3v(default) (fixed internal pullup) ButtonA

Peripherals

PINOUT

Peripheral function io0 io2 io4 io5 io12 io13 io14 io15 io16 io17 io18 io19 io21 io22 io23 io25 io26 io27 io32 io33 io34 io35 io36 io37 io38 io39
IO output YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES - - - - - -
input YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES
AD AD - - - - - - - - - - - - - - - - - - YES YES YES YES YES - - YES
PWM IO YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES - - - - - -
UART TX YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES - - - - - -
RX YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES - - - - -
CTS YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES - - - - -
RTS YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES - - - - - -
SPI CLK YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES - - - - - -
MOSI YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES - - - - - -
MISO YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES - - - - -
I2C SDA YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES - - - - - -
SCL YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES - - - - -
LogicAnalyzer IO YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES
Measure PULSE YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES - - - - -
ECHO YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES

Peripherals: IO

output

Each IO can put out digital values.

Drive method can be configured independently for each IO.
Not only for io.output(), but also for UART and SPI you can choose your preferred drive method.

input

There is only one input method. Threshold is CMOS level.

internal weak pull-up/pull-dow

Pull up and down can be configured independently for each IO.

There are three types as below.

Type Pull to Detail
floating   Default
pull-up 3v
pull-down gnd

Some io has fixed internel pull up/down for startup configration.

all channnel same time.

All channel ad can be used. It will not affect the sampling rate.

30 samples/sec or slower

Maximum sampling rate depends on your network speed and on obnizOS version.

12bit

Ad accuracy is 12bit.

PWM

6(pwm0 to pwm5) are available.

UART

2 (uart0 to uart1) are available.

Available Configration

  1. baud: number (default 115200)
  2. stop: stop bit length 1(default)/1.5/2
  3. bits: data bits 8(default)/5/6/7
  4. parity: parity check "off"(default)/"odd"/"even"
  5. flowcontrol: flow control "off"(default)/"rts"/"cts"/"rts-cts"
  6. rts: io for rts (optional)
  7. cts: io for cts (optional)

SPI

2 (spi0 to spi1) are available.

Only Master mode.

I2C

1 (i2c0) is available and used for Grove connector, motion sensors(M5Stack Gray only).

Max speed is 1Mhz.
Master/Slave mode.
But slave mode only works with "written" events. You can't set data to be read.

LogicAnalyzer

1 (logicanalyzer) is available.

Measure

1 (measure) is available.

Embeded

BLE

BLE32 embeded Bluetooth Module

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