Meld Homepage , Electronic PCB PCBA , Software .NET AVR PLM BOM , Network TCP UDP MQTT , Microcontrollers AVR ARM , Powersupplys Switchmode , Nursecall MC5000 CD2000

2017-09-13 14:05 Doc
How to Blink an LED on Raspberry Pi 3 Node.js

2017-09-05 08:01 Annual report in danish 2016/2017

2017-08-21 09:00 New PCB for controlling a garage door over wifi mqtt

2017-07-08 11:39 Link
I have added Bootloader to my LinkIO network interface, so the software can be updated over the network.

2017-06-04 11:25 Link
Connet MQTT
Input(Button Australia) to an
Output(Doorbell Denmark)
In Node-RED on a Raspberry Pi
Over amazon CloudMQTT

2017-05-18 08:44 Doc
Some reading,
How an accounting system works.

2017-05-05 12:45 An updated version of the I2C I/O card in BLUE ENIG from a new Chinese PCB manufacture.

2017-04-07 15:17 Doc
How to Get Digikey Prices over Https SSL TLS1.2 Framework 2.0

2017-03-17 09:14 Link
I changed the Count column to Qty. And Added Export to Html.

2017-02-06 07:48 Link
I Have added setup of the part list view, so i can have different formats for each supplier.

2016-12-27 10:32 I'm working on a
Battery Powered
Sub 1GHz Transceiver
Demo Board

2016-11-30 08:30 I Have made 2 pcbs for
Tunstall on one panel

2016-11-03 11:22 Link
I have added MQTT protocol to my Ethernet I/O Box
Control MQTT see

2016-10-27 09:10 Oxygen control Test Bench

2016-09-05 09:35 I have found a chinese firm where i can buy all molex like connectors to 1/10 of the price. :-)

2016-08-29 08:55 Link
I'm Working on my PLM / BOM Part list program, have added Product groups.

2016-08-11 16:00 Annual report in danish 2015/2016

2016-07-08 20:02 An Updated version of the
Can Bus / Lin Bus
Nurse call display unit,
with a new display, present sensor
and a better/cheaper power supply
consumption 30mA @ 24V

2016-06-29 07:09 Doc
MC01 Demo Board
Hollo World App
Input PortB Output PortD

2016-06-07 07:21 My first PCB Panel in red:-),
from a new PCB manufacturer,
from Left:
1.Meldco Demoboard.
2.New nurse call display unit.
3.Wireless Transceiver.

2016-04-27 12:15 I have assembled 70 pcs
M281 H-Stop Push Button.

2016-04-26 16:00 I have engraved 70 pcs front plate for h-stop, what a mess :-)

2016-04-13 10:11 Doc
2$ AVR ISP programmer.
Solving AVRDUDE USBasp
error signature 102.

2016-04-07 11:50 Today I have serviced 4 DSSR116 Power Supplies for Energinet.
it was a problem to get axial electrolytic capacitor, so I used a standing.

2016-03-04 19:07 I have been testing the oxygen control at Jens-EMC.

2016-02-14 10:40 I'm working on version 2 of the oxygen measure instrumen.

2016-02-03 11:46 I'm working on a new order of 130pcs. M216 Fuga PullSwitch

2016-01-08 09:24 My partner Michael have made this ZigBee transceiver.

2015-12-04 09:05 I have received the finished label for the I/O ethernet box and some other components from China.

2015-11-20 09:24 I'm working on a new setting tool for the network unit so all the settings can be done from one place.

2015-11-09 08:31 I have assembled the first prototype, 4 input / 4 open collector output

2015-10-15 10:47 I have received my first components from Digi-Key in USA, I will use them as my main supply chain, so i easy can move my production. it took 3 days to get this order. Over 340kr the shipping is free, the components are nicely packed :-). I like there open price policy. When a firm is import registered, it should not pay import vat, but if the package exceeds 1150kr it shall pay Customs.

2015-10-08 10:52 I have assembled the first network card with poe, it works.

2015-10-03 08:52 I'm waiting for the first prototype

2015-09-15 11:30 I'm working on a network based input / output box

2015-08-23 11:09 Annual report in danish 2014/2015

2015-08-14 20:25 I have bought some electronics boxes from china, i will use one of them for my network interface.

2015-07-03 13:45 Door bell over the internet, you push the button in Australia, and the led lights up in Denmark :-)

2015-06-12 11:31 I have made this wall socket for LINDPRO

2015-05-28 16:40 Web Server Led On/Off function, Running at POE.
(Power Over Ethernet)

2015-05-27 16:16 And the Class1 3,84W POE supply works.

2015-05-18 12:05 I have been looking after a cheap alternative to national switching regulator, now i have found these to only 0,4$, a 0,5A and 1A version, input voltage 5V-35V, output voltage is set by a voltage divider, its running at 1Mhz so the inductor can be as small as 10uH. I have build these test circuits with 5V output.

2015-04-05 10:15 The hardware for the network interface is working, i have made a software so i can ping it, i still need to test the POE power supply i'm waiting for a sample of the POE ic.

2015-03-24 07:49 New Fuga Hw Pull switch like K0153

2015-02-11 11:02 And a new version af the LIN Bus Pull switch / Push switch

2015-02-10 11:32 I'm working on a new version of the network interface with POE Class1.

2015-01-19 13:24 I have assembled version 1 of the new oxygen measure instrument, everything seems to work. :-)

2014-12-22 11:02 I'm working on my BOM program, i have added a column OrderInfo with multiple lines so i can have many supplier on each component, i want to add DigiKey order numbers so i can meet my chinese subcontractor requirements to a bom list.

2014-11-22 09:06 This week i have been working on a new oxygen measure instrument.

2014-10-21 08:20 mcXLink, is a service for handling xml communication between applications, by lan socket.

2014-09-21 09:32 I'm working on a new web interface, for handling calls

2014-08-26 10:17 I'm playing with socket in Android Java, i have made a Tcp Client

2014-08-12 07:50 Annual report in danish 2013/2014

2014-07-13 09:42 I have added packet translation to my logging tool.

2014-07-07 12:34 I'm working on my demo suitcase. I will make a foam where i can place 12 units in.

2014-06-06 13:08 I'm playing with the cnc maschinen, with my brother's daughter. :-)

2014-06-04 09:12 I have found these metal contacts in china. I will try using them in a string/pull switch.

2014-05-20 16:34 I have produced 25 signs for a door telephone.

2014-05-16 08:10 I have received the new version of the red oled display from Truly in Hongkong, this version is with the new driver chip, this have a new scroll function i'm going to play with :-)

2014-05-16 08:04 I have drilled this test fixture in my CNC machine, it's for testing a positions module for a Dect phone.

2014-05-01 10:18 This week i'm working on the canbus logger

2014-04-16 09:26 Doc
Bootloader Protocol structure

2014-03-28 08:01 This week i have been working on the nursecall setup tool

2014-03-24 11:23 Doc
Nurse call Protocol structure

2014-03-10 10:51 And the front plate for the display / presence unit

2014-03-10 08:28 I have made a cnc program and a frame where the frontplate fits in to.

2014-02-28 09:06 The first frontplade samples from china, they are nice.

2014-02-20 10:38 This week i'm working on the transparent lid with a nurse their lights up, for the Lin Bus pull switch.
I have a chinese firm on the case.

2014-01-30 11:29 Result Cnc demo 200mm/min

2014-01-30 11:09 Cnc demo 200mm/min

2014-01-06 09:03 I have bought this carving cnc machine CNC3040, so i can do my cnc work myself. I just have to figure out how it works, but that's the fun part.. :-)

2013-12-17 07:52 I have assembled version 2 of the Bosch oxygen sensor interface,
now with Plugged vias.

2013-12-12 10:18 I have built this test circuit for the MC34063 switch regulator input 10 to 40V, output 5V 300mA, the MC34063 is the cheapest switch regulate available, you can get it for under 1kr. all others cost about 10kr. The circuit works very well.

2013-11-29 08:44 This week i have been working on the LIN Bus Pull Switch, I'm still missing to designing a transparent lid with a nurse their lights up.

2013-11-26 09:20 I'm working on a new design with my brother's daughter. :-)

2013-10-31 09:16 This week i have been working on assembling / test of 5pcs amplifier for the new Bosch oxygen sensor.

2013-10-08 11:07 This week i have been working on a amplifier for a new Bosch oxygen sensor.

2013-10-08 11:07 Image of the finished LIN Bus Lamp

2013-10-01 11:42 I have received the finished PCB for the Lin Bus Lamp

2013-09-17 10:01 Full demo

2013-09-10 12:44 First demo

2013-09-10 09:37 I have assembled the first prototype of the presence/display unit with the new pcb and it works.

2013-09-09 07:42 I have been working on a preliminary setting tool for my presence/display unit

2013-08-29 11:42 I have received the finished PCB for the presence/display unit

2013-08-21 07:53 Annual report in danish 2012/2013

2013-07-01 09:10 Status Opus66 presence/display unit.
So far i have written and tested the software for:
1. Can Bus Interface√
2. Can Bootloader√
3. Proximity sensor√
4. 7 step pwm sound system√
5. Oled display interface√
6. Lin Bus Interface√
The Hardware is now fully defined and testet. The next project will be to make one unit more and some units for the LIN Bus so i can write the call stack software.

2013-06-24 10:41 I have been working on the LIN bus interface for 2 weeks now and
i can only blink with a LED. I'm fighting with a problem the I/O IC
goes in to sleep mode and i can´t wake it. (I have fixed it☺)
I'm still not sure that it is the right device for the job.

2013-06-24 08:05 I have received the last 360pcs.

2013-06-12 08:05 I have received the first assembled PCBs from China, they are
exactly as I have described them.
They have only mounted the SMD components and tested them. This is a sample shipment, I while get 360pcs later.

2013-05-14 08:19 This is my first service tool for canbus
When the bootloader is programmed in to the processor,
it can program new software in a node with at specefik address and
change the setting of the node there is placed 1000m away on the bus.

2013-05-08 11:59 In this week i am working on
how to get PCBs assembled in china

2013-05-05 11:02 In this week i have made a
differential amplifier / rectifier for triggering a scope
when a fault condition happens

2013-04-16 10:22 At the time being,
I am working on mounting
400 pcs M106 HW Lamp.

2013-02-28 08:22 I have received 3 pcs 1,58" red oled
they have a really good brightness at only 10mA.

2013-02-22 10:12 This week i have been working on my website so i can access all my documentation and part lists
from everywhere by a browser.

2013-02-13 10:34 I have received
3pcs 180A 3 phase mosfet.
For my 3 phase BLDC motor controll.

2013-01-22 11:06 I have recived LEDs from my chinese partner.
The brightness is really good at 20mA

2013-01-12 11:16 Now i have assembled the
first model of my display.
Double display, back against back.

2012-12-17 10:05 :)

2012-12-15 11:47 This week i am working on my Opus66 presence/display unit.
So far i have written and tested the software for:
1. Can Bus Interface√
2. Can Bootloader√
3. Proximity sensor√
4. 7 step pwm sound system√
5. Oled display interface√
I will get the display in red later.
The only thing i am missing to test is the Lin Bus Interface.

2012-12-03 13:45 Doc
System layout

2012-10-29 07:55 Picture of my first ethernet interface.

2012-10-25 10:16 Brainstorming at

2012-10-17 08:37 This week I'm working on a can bus bootloader using atmel GCC bootloader protocol, to their atmega64M1 can processor.

2012-09-21 08:07 In cooperation with i have made, the first draft of the display metal box. it looks very nice.

2012-09-03 13:21 This week's project 3 phase BLDC motor control

2012-08-14 13:39 Now i have received PCB for my Interface for LFH2210 Foot Control, I got them made in china.

2012-07-30 07:51 My first prototype works, there are some minor details i need to adjust.

2012-07-09 11:56 Today I have repaired this Oxygen measurement equipment.

2012-06-25 13:09 Today I have repaired this 5V Power Supply for Energinet.

2012-06-20 08:13 Interface for Philips Foot Control LFH2210/00

2012-06-12 20:56 Today i received my first samples,
from left PMMA colored glass,
connectors from samtec,
Network Processor from wiznet,
Display from china.

2012-05-22 22:15 Anuther funny day at the office

2012-05-17 13:47 We have chosen e-conomic as our Accounting system,
because it's easy to use and web based

2012-05-16 14:38 Currently i am working on repairing 4 alarm units for a powerstation

2012-05-15 13:01 Why does my logo look like that:
it's the current in a coil, when adding a square pwm signal.
delta I=U*t/L
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