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I decided to look into the SOMO-14D Embedded Audio-Sound Module as an alternative to the ISD2560 sound recorder chip, which I have used successfully in the past for a sailboat race countdown start timer. It may also prove to be a useful unit for model sound effects, commanded by a spare RC...

This project takes a signal from a hobby RC radio receiver, manipulates the signal, then outputs to a servo. The user can set up the following by pressing a button on the board: Neutral position Maximum travel Minimum travel Failsafe position I use it to extend servo travel by up to 180° for use...

In the process of designing a device to increase the travel of a hobby servo, I discovered that the servo and pulsout commands do not seem to give the same position information to the servo. I would have expected the following examples to give the same result: for b2=0 to 150 pulsout 1,200...

I have a moderately fast single engined scale electric boat which is a bit overweight. It currently cariies two 6 x subC NiMH packs of 3500 mAh each. I am looking into replacing them with 7.2V Li-ion pack(s), but am concerned about damage due to over-discharge. Overcharging is not an issue. I...

I am designing a rudder/throttle mixer for a 3-engined RC boat using a -14M. Input pulses are taken in for rudder and throttle on pins 1 & 2, and pulses are output on pins 1, 3 & 5 (to the 3 motor speed controllers). Pins 0, 2 and 4 drive LED indicators. I was getting wierd results on the pulse...

I've been making PCB's for some time using iron-on transfer from a laser print on paper. I bought some glossy paper recently in the US, and have just tried it. It works perfectly. NO imperfections, NO smearing, EASY to remove with a bit of soap and water, NO furry redidue across the bare copper...

My first venture into the world of stepper motors. I had no problem getting the bipolar stepper (salvaged from a printer) to work via an L293 bridge driven by a Picaxe-18. Variable speed easily achieved by a variable pause between each step (as long as the pause >4ms). I now need to control...

I am exploring the possibility of a Picaxe controlled 12V sealed lead-acid (SLA) battery charger, so need to provide a regulated voltage to a low impedance load. The scheme suggested in a previous thread ("Driving low impedance with PWMOUT") seems to employ the power transistor (MOSFET...

I am attempting to modify the response of an RC sevo to give a non-linear response (e.g a square law relationship between the PWM from the receiver and the PWM to the servo). I am having some difficulty within the confines of integer maths and word variable length. I understand that the actual...

I am considering building a new bench power supply (my old one has bit the dust). It strikes me that a Picaxe may be ideally suited by using ADC to monitor the DC supply and PWM (driving a MOSFET) to regulate it to a pre-set value. With a voltage divide/pot arrangement on the ADC input, this...