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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@ClearMemory041063
This link might help. Note it uses a 0.9 duty cycle.
http://www.espruino.com/Pico+Infrared
Since you don't have a scope you might try this one liner to see the LED flashing.
analogWrite(A5,0.5,{freq:0.5});
It uses a lower frequency so you can see the flashes.
I did this one liner to flash the Green LED on a Pico. This is not PWM pin so you have to use the software PWM. PWM pins use the Timer peripherals built into the ARM chip.
analogWrite(B12,0.5,{freq:0.5,soft:true});