--Message-Boundary-23207 Content-type: text/plain; charset=US-ASCII Content-transfer-encoding: 7BIT Content-description: Mail message body > I noticed Peter Moreton mentioned having a Lassen SQ connected to a > PIC18F452. > Peter if you're still on the list: Can you tell me what you did to > get them talking? Hi Matt, I'm not sure if it was the hardware interface you wanted help on but I'm sure someone recently was wanting ideas on 3V/5V logic conversion. Here's a little circuit I've posted here before. Interfaces 5V micro to 3.3V Lassen SQ GPS. Not too complicated. The 3.3V TXD from the GPS is level shifted to 5V with bipolar transistors and resistors. Two stages required or else the data gets inverted. The 5V TXD from the micro is crudely shifted down in voltage with just a series resistor. Works because the GPS RXD input has protection diodes, one of which will clamp the signal to 3.3V + one diode drop. Could have used the two transistor circuit as above with the two resistors tied to +3.3V instead, but hey, this way uses less parts! -- Brent Brown, Electronic Design Solutions 16 English Street, Hamilton, New Zealand Ph/fax: +64 7 849 0069 Mobile/txt: 025 334 069 eMail: brent.brown@clear.net.nz -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details. --Message-Boundary-23207 Content-type: Image/GIF; name="GPS.gif" Content-disposition: attachment; filename="GPS.gif" Content-transfer-encoding: BASE64 R0lGODlhqQFeAfcAAAAAAAAAMwAAZgAAmQAAzAAA/wAzAAAzMwAzZgAzmQAzzAAz/wBmAABm MwBmZgBmmQBmzABm/wCZAACZMwCZZgCZmQCZzACZ/wDMAADMMwDMZgDMmQDMzADM/wD/AAD/ MwD/ZgD/mQD/zAD//zMAADMAMzMAZjMAmTMAzDMA/zMzADMzMzMzZjMzmTMzzDMz/zNmADNm MzNmZjNmmTNmzDNm/zOZADOZMzOZZjOZmTOZzDOZ/zPMADPMMzPMZjPMmTPMzDPM/zP/ADP/ MzP/ZjP/mTP/zDP//2YAAGYAM2YAZmYAmWYAzGYA/2YzAGYzM2YzZmYzmWYzzGYz/2ZmAGZm M2ZmZmZmmWZmzGZm/2aZAGaZM2aZZmaZmWaZzGaZ/2bMAGbMM2bMZmbMmWbMzGbM/2b/AGb/ M2b/Zmb/mWb/zGb//5kAAJkAM5kAZpkAmZkAzJkA/5kzAJkzM5kzZpkzmZkzzJkz/5lmAJlm M5lmZplmmZlmzJlm/5mZAJmZM5mZZpmZmZmZzJmZ/5nMAJnMM5nMZpnMmZnMzJnM/5n/AJn/ M5n/Zpn/mZn/zJn//8wAAMwAM8wAZswAmcwAzMwA/8wzAMwzM8wzZswzmcwzzMwz/8xmAMxm M8xmZsxmmcxmzMxm/8yZAMyZM8yZZsyZmcyZzMyZ/8zMAMzMM8zMZszMmczMzMzM/8z/AMz/ 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