NAW_OEM Wideband Module
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NAW_OEM Features:
- Smallest wideband controller in the world, 1.358" x 0.9"
- Lowest priced wideband controller in the world @ $50 USD
- 99% assembled
- 0.01 Lambda accuracy over 10 to 19 AFR
- 7 LED display of AFR/Lambda
- Supports dual LED display of LSU temperature
- 0-5v Linear Voltage Output; 9-19 AFR, 0.612-1.293 Lam
- Simulated Narrowband output
- Digital PID temperature controller
- Digital PID pump cell controller
- Over voltage and reverse voltage protected
- Onboard self resetting thermal fuse for over current protection
- I2C bus for AFR, Free Air calibration, Sensor Temperature
- 1 yr warranty
- $75
NAW_OEM Documentation is here
This module is not a gimmick, it is the world's smallest and lowest cost standalone wideband controller. Do not let the price and size fool you, it is a high performance, fully featured wideband controller.
The module is almost fully assembled, you need to solder in connectors and LEDs if you want to use the LED display.
NAW_OEM is only possible due to the unique microcontroller it uses, Cypress PSoC, no other wideband controller on the market uses PSoC. All external ICs that you typically find on a wideband controller are implemented inside the PSoC silicon using programmable digital and switch capacitor blocks. The elimination of external components increases accuracy because there are less component tolerances to take into account, it also dramatically reduces cost and the size of the controller, furthermore the small size reduces shipping cost and packaging material. For the core wideband functionality only 4 resistors, 1 capacitor, and a MOSFET are required. The rest of the components are there for; voltage protection, voltage regulation, linear voltage output, simulated narrowband output, and LED display.
Originally NAW_OEM was meant soley for the purposes of integration into other manufacturer's products, hence the OEM suffix and small size. After the initial design was complete, I was so satisfied with its performance that I decided to add additional components; voltage protection, voltage regulator, output buffers, and LED footprints, so that the module can serve both the OEM and standalone market with the same hardware.
Specifically for product integration purposes, I will soon release NAW_OEM_I2C, the hardware is the exact same as NAW_OEM, but the firmware has been updated to include an I2C communications channel. Up to 64 NAW_OEM_I2C modules will be able to share the same I2C bus simultaneously.
Accuracy:
Accuracy of 0.01 Lambda is over the 10-19 AFR, 0.68-1.293 Lambda, range. I can not guarantee 0.01 Lambda accuracy for gases richer than 10 AFR, 0.68 Lambda.
LED Display:
The LED display is composed of 7 LEDs, you chose the color of LEDs you want. By grounding pin 14 on the module you can chose between 2 display modes; wide range and narrow range. In wide range, each LED has a resolution of 1 AFR, the range of display is 11-16 AFR. In narrow range, each LED has a resolution of 0.5 AFR, the range of the display is 11-13.5 AFR.
Wide Range LED Output:
|
AFR |
Lambda |
LED1 |
LED2 |
LED3 |
LED4 |
LED5 |
LED6 |
LED7 |
|
AFR<11 |
Lambda<0.748 |
On |
off |
Off |
Off |
off |
Off |
off |
|
11<AFR<12 |
0.748<Lambda<0.816 |
Off |
On |
Off |
Off |
off |
Off |
off |
|
12<AFR<13 |
0.816<Lambda<0.884 |
Off |
off |
On |
Off |
off |
Off |
off |
|
13<AFR<14 |
0.884<Lambda<0.952 |
Off |
off |
Off |
On |
off |
Off |
off |
|
14<AFR<15 |
0.952<Lambda<1.020 |
Off |
off |
Off |
Off |
On |
Off |
off |
|
15<AFR<16 |
1.020<Lambda<1.088 |
Off |
off |
Off |
Off |
off |
On |
off |
|
16<AFR |
1.088<Lambda |
Off |
off |
Off |
Off |
off |
Off |
On |
Narrow Range LED Output:
|
AFR |
Lambda |
LED1 |
LED2 |
LED3 |
LED4 |
LED5 |
LED6 |
LED7 |
|
AFR<11 |
Lambda<0.748 |
On |
off |
Off |
Off |
Off |
Off |
off |
|
11<AFR<11.5 |
0.748<Lambda<0.782 |
Off |
On |
Off |
Off |
Off |
Off |
off |
|
11.5<AFR<12 |
0.782<Lambda<0.816 |
Off |
off |
On |
Off |
Off |
Off |
off |
|
12<AFR<12.5 |
0.816<Lambda<0.850 |
Off |
off |
Off |
On |
Off |
Off |
off |
|
12.5<AFR<13 |
0.850<Lambda<0.884 |
Off |
off |
Off |
Off |
On |
Off |
off |
|
13<AFR<13.5 |
0.884<Lambda<0.918 |
Off |
off |
Off |
Off |
Off |
On |
Off |
|
13.5<AFR |
0.918<Lambda |
Off |
off |
Off |
Off |
Off |
Off |
On |
Linear Voltage Output:
The linear voltage out is a 0-5[v] linear output from 9 to 19 AFR, 0.612 to1.293 Lambda.
Optional Temperature Display:
The module also supports 2 external LEDs to show the temperature of the Bosch LSU sensor. These LEDs are connected externally as there are no footprints on the PCB for them.
|
Heater Status LED 0 |
Heater Status LED 1 |
Sensor Temperature |
|
On |
Off |
Cold |
|
Off |
On |
Perfect |
|
On |
On |
Too hot |
