diff --git a/en/sigmastar-research.md b/en/sigmastar-research.md
index 366a0bd..814b71c 100644
--- a/en/sigmastar-research.md
+++ b/en/sigmastar-research.md
@@ -14,3 +14,14 @@ echo 10000 > /sys/class/pwm/pwmchip0/pwm1/period
 echo 25 > /sys/class/pwm/pwmchip0/pwm1/duty_cycle
 echo 1 > /sys/class/pwm/pwmchip0/pwm1/enable
 ```
+
+#### Control PWM IR led on 8232SWC-WE-B device, SSC335DE
+
+```
+# set PWM4 on GPIO4
+devmem 0x1f203C1C w 0x3000 
+echo 4 > /sys/class/pwm/pwmchip0/export
+echo 40000 > /sys/class/pwm/pwmchip0/pwm4/period
+echo 40 > /sys/class/pwm/pwmchip0/pwm4/duty_cycle
+echo 1 > /sys/class/pwm/pwmchip0/pwm4/enable
+```